今年寒假打算用Java把杭电2000-2099全部AC(现在持续更新)，如下是题目链接，之后是我的题解,全部做完后我会把所有AC的题解打包上传的

题号	题名	题号	题名
2000	ASCII码排序	2001	计算两点间的距离
2002	计算球体积	2003	求绝对值
2004	成绩转换	2005	第几天？
2006	求奇数的乘积	2007	平方和与立方和
2008	数值统计	2009	求数列的和
2010	水仙花数	2011	多项式求和
2012	素数判定	2013	蟠桃记
2014	青年歌手大奖赛_评委会打分	2015	偶数求和
2016	数据的交换输出	2017	字符串统计
2018	母牛的故事	2019	数列有序!
2020	绝对值排序	2021	发工资咯：）
2022	海选女主角	2023	求平均成绩
2024	C语言合法标识符	2025	查找最大元素
2026	首字母变大写	2027	统计元音
2028	Lowest Common Multiple Plus	2029	Palindromes _easy version
2030	汉字统计	2031	进制转换
2032	杨辉三角	2033	人见人爱A+B
2034	人见人爱A-B	2035	人见人爱A^B
2036	改革春风吹满地	2037	今年暑假不AC
2038	test	2039	三角形
2040	亲和数	2041	超级楼梯
2042	不容易系列之二	2043	密码
2044	一只小蜜蜂...	2045	不容易系列之(3)—— LELE的RPG难题
2046	骨牌铺方格	2047	阿牛的EOF牛肉串
2048	神、上帝以及老天爷	2049	不容易系列之(4)——考新郎
2050	折线分割平面	2051	Bitset
2052	Picture	2053	Switch Game
2054	A == B n	2055	An easy problem
2056	Rectangles	2057	A + B Again
2058	The sum problem	2059	龟兔赛跑
2060	Snooker	2061	Treasure the new start, freshmen!
2062	Subset sequence	2063	过山车
2064	汉诺塔III	2065	"红色病毒"问题
2066	一个人的旅行	2067	小兔的棋盘
2068	RPG的错排	2069	Coin Change
2070	Fibbonacci Number	2071	Max Num
2072	单词数	2073	无限的路
2074	叠筐	2075	A\|B?
2076	夹角有多大(题目已修改,注意读题)	2077	汉诺塔IV
2078	复习时间	2079	选课时间(题目已修改,注意读题)
2080	夹角有多大II	2081	手机短号
2082	找单词	2083	简易版之最短距离
2084	数塔	2085	核反应堆
2086	A1 = n	2087	剪花布条
2088	Box of Bricks	2089	不要62
2090	算菜价	2091	空心三角形
2092	整数解	2093	考试排名
2094	产生冠军	2095	find your present (2)
2096	小明A+B	2097	Sky数
2098	分拆素数和	2099	整除的尾数

如下是2000-2099的题解代码,去掉包并把类名改为Main就可以提交

温馨提示:使用左边的目录查找你所需要查看的题目代码更快哦^-^

P2000.ASCII码排序

P2001.计算两点间的距离

P2002.计算球体积

P2003.求绝对值

P2004.成绩转换

P2005.第几天？

P2006.求奇数的乘积

P2007.平方和与立方和

P2008.数值统计

P2009求数列的和

P2010.水仙花数

P2011.多项式求和

P2012.素数判定

P2013.蟠桃记

P2014.青年歌手大奖赛_评委会打分

P2015.偶数求和

P2016.数据的交换输出

P2017.字符串统计

P2018.母牛的故事

P2019.数列有序!

P2020.绝对值排序

P2021.发工资咯：）

P2022.海选女主角

P2023.求平均成绩

P2024.C语言合法标识符

P2025.查找最大元素

P2026.首字母变大写

P2027.统计元音

P2028.Lowest Common Multiple Plus

P2029.Palindromes _easy version

P2030.汉字统计

P2031.进制转换

P2032.杨辉三角

P2033.人见人爱A+B

P2034.人见人爱A-B

P2035.人见人爱A^B

P2037.今年暑假不AC

P2038.test

P2039.三角形

P2040.亲和数

P2041.超级楼梯

P2042.不容易系列之二

P2043.密码

P2044.一只小蜜蜂...

P2045.不容易系列之(3)—— LELE的RPG难题

P2046.骨牌铺方格

P2047.阿牛的EOF牛肉串

P2048.神、上帝以及老天爷

P2049.不容易系列之(4)——考新郎

P2050.折线分割平面

P2051.Bitset

P2052.Picture

P2053.Switch Game

P2054.A == B ?

P2055.An easy problem

P2057.A + B Again

P2058.The sum problem

P2070.Fibbonacci Number

P2071.Max Num

P2072.单词数

P2073.无限的路

P2074.叠筐

P2075.A|B?

P2076.夹角有多大(题目已修改,注意读题)

P2080.夹角有多大II

P2081.手机短号

P2085.核反应堆

P2086.A1 = ?

P2087.剪花布条

P2089.不要62

P2090.算菜价

P2091.空心三角形

P2092.整数解

P2094.产生冠军

P2095.find your present (2)

P2096.小明A+B

P2097.Sky数

P2098.分拆素数和

P2099.整除的尾数

未完......(更新中)

联系方式

P2000.ASCII码排序

package hdu经典100题;import java.util.Scanner;public class P2000 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {String str = in.next();int a = str.charAt(0);int b = str.charAt(1);int c = str.charAt(2);int temp;if(b>a) {temp = a;a = b;b = temp;}if(c>a) {temp = a;a = c;c = temp;}if(c>b) {temp = b;b = c;c = temp;}System.out.println((char)c+" "+(char)b+" "+(char)a);}}}

P2001.计算两点间的距离

package hdu经典100题;import java.text.DecimalFormat;
import java.util.Scanner;public class P2001 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {double x1 = in.nextDouble();double y1 = in.nextDouble();double x2 = in.nextDouble();double y2 = in.nextDouble();DecimalFormat decimalFormat = new DecimalFormat(".00");System.out.println(decimalFormat.format(Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))));}}
}

P2002.计算球体积

package hdu经典100题;import java.util.Scanner;public class P2002 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {double r = in.nextDouble();System.out.printf("%.3f\n",4.0/3.0*r*r*r*3.1415927);}}
}

P2003.求绝对值

package hdu经典100题;import java.text.DecimalFormat;
import java.util.Scanner;public class P2003 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {double num = in.nextDouble();DecimalFormat decimalFormat = new DecimalFormat(".00");System.out.println(decimalFormat.format(Math.abs(num)));}}}

P2004.成绩转换

package hdu经典100题;import java.util.Scanner;public class P2004 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while (in.hasNext()) {int grade = in.nextInt();if(grade<0 || grade>100) {System.out.println("Score is error!");}else {switch (grade / 10) {case 10:System.out.println("A");break;case 9:System.out.println("A");break;case 8:System.out.println("B");break;case 7:System.out.println("C");break;case 6:System.out.println("D");break;default:System.out.println("E");break;}}}}}

P2005.第几天？

package hdu经典100题;import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Scanner;public class P2005 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {String date = in.next();int year = Integer.valueOf(date.substring(0,4));int month = Integer.valueOf(date.substring(5, date.lastIndexOf('/')));int day = Integer.valueOf(date.substring(date.lastIndexOf('/')+1));Calendar calendar = new GregorianCalendar(year, month-1, day);System.out.println(calendar.get(Calendar.DAY_OF_YEAR));}}}

P2006.求奇数的乘积

package hdu经典100题;import java.util.Scanner;public class P2006 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();int cj = 1;while(n!=0) {int num = in.nextInt();if(num%2!=0) {cj = cj * num;}n--;}System.out.println(cj);}}}

P2007.平方和与立方和

package hdu经典100题;import java.util.Scanner;public class P2007 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNext()) {int m = in.nextInt();int n = in.nextInt();int temp;if(m>n) {temp = m;m = n;n = temp;}int sumOu = 0;int sumJi = 0;for (int i = m; i <= n; i++) {if(i%2==0) {sumOu+=i*i;}else {sumJi+=i*i*i;}}System.out.println(sumOu+" "+sumJi);}}
}

P2008.数值统计

package hdu经典100题;import java.util.Scanner;public class P2008 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();if(n==0) {break;}int amountFu = 0;int amountZreo = 0;int amountZheng = 0;while(n!=0) {double num = in.nextDouble();if(num==0) {amountZreo++;}else if (num<0) {amountFu++;}else {amountZheng++;}n--;}System.out.println(amountFu+" "+amountZreo+" "+amountZheng);}}
}

P2009求数列的和

package hdu经典100题;import java.text.DecimalFormat;
import java.util.Scanner;public class P2009 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {double n = in.nextInt();int m = in.nextInt()-1;double sum = n;while(m!=0) {sum+=Math.sqrt(n);n = Math.sqrt(n);m--;}DecimalFormat format = new DecimalFormat(".00");System.out.println(format.format(sum));}}}

P2010.水仙花数

package hdu经典100题;import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;public class P2010 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int m = in.nextInt();int n = in.nextInt();List<Integer> list = new ArrayList<>();for (int i = m; i <=n; i++) {String strNum = String.valueOf(i);if(i==Integer.valueOf(String.valueOf(strNum.charAt(0)))*Integer.valueOf(String.valueOf(strNum.charAt(0)))*Integer.valueOf(String.valueOf(strNum.charAt(0)))+Integer.valueOf(String.valueOf(strNum.charAt(1)))*Integer.valueOf(String.valueOf(strNum.charAt(1)))*Integer.valueOf(String.valueOf(strNum.charAt(1)))+Integer.valueOf(String.valueOf(strNum.charAt(2)))*Integer.valueOf(String.valueOf(strNum.charAt(2)))*Integer.valueOf(String.valueOf(strNum.charAt(2)))) {list.add(i);}}if(list.size()==0) {System.out.println("no");}else {Collections.sort(list);for (int i = 0; i < list.size()-1; i++) {System.out.print(list.get(i)+" ");}System.out.println(list.get(list.size()-1));}}}}

P2011.多项式求和

package hdu经典100题;import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;public class P2011 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int m = in.nextInt();int nums [] = new int [m];for (int i = 0; i < nums.length; i++) {nums[i] = in.nextInt();}List<Double> list = new ArrayList<>();for (int i = 0; i < nums.length; i++) {double sum =0;for (int j = 1; j <=nums[i]; j++) {if(j%2==0) {sum+=(-1*1.0/j);}else {sum+=1.0/j;}}list.add(sum);}DecimalFormat format = new DecimalFormat("0.00");for (int i = 0; i < list.size(); i++) {System.out.println(format.format(list.get(i)));}}}

P2012.素数判定

package hdu经典100题;import java.util.Arrays;
import java.util.Scanner;public class P2012 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);//模拟int [] nums = new int[3000];nums[2] = 0;nums[3] = 0;nums[5] = 0;for (int i = 2; i < nums.length; i++) {int j=2;if(nums[i]==0) {for (; j*i < nums.length; j++) {nums[j*i] = 1;}}}while(in.hasNext()) {int x = in.nextInt();int y = in.nextInt();if(x==0 && y==0) {break;}int i;for ( i = x; i <=y; i++) {if(nums[(i*i+i+41)]!=0) {break;}}if(i==y+1) {System.out.println("OK");}else {System.out.println("Sorry");}}}}

P2013.蟠桃记

package hdu经典100题;import java.util.Scanner;public class P2013 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt()-1;int amount = 1;while(n!=0) {amount = 2*(amount+1);n--;}System.out.println(amount);}}}

P2014.青年歌手大奖赛_评委会打分

package hdu经典100题;import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;public class P2014 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();List<Double> list = new ArrayList<>();for (int i = 0; i < n; i++) {list.add(in.nextDouble());}Collections.sort(list);list.remove(0);list.remove(list.size()-1);double sum = 0;for (int i = 0; i < list.size(); i++) {sum+=list.get(i);}DecimalFormat format = new DecimalFormat("0.00");System.out.println(format.format(sum/list.size()));}}}

P2015.偶数求和

package hdu经典100题;import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;public class P2015 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int[] nums = new int[100];nums[0] = 2;for (int i = 1; i < nums.length; i++) {nums[i] = nums[i-1]+2;}while(in.hasNext()) {int n = in.nextInt();int m = in.nextInt();List<Integer> list = new ArrayList<>();if(n%m==0) {for (int i = 0; i < n; i+=m) {int sum = 0;for (int j = i; j < i+m;j++) {sum+=nums[j];}list.add(sum/m);}}else {int i = 0;for (; i < n-(n%m); i+=m) {int sum = 0;for (int j = i; j < i+m;j++) {sum+=nums[j];}list.add(sum/m);}int sum = 0;m = n%m;for (int j = i; j < n; j++) {sum+=nums[j];}list.add(sum/m);}for (int i = 0; i < list.size()-1; i++) {System.out.print(list.get(i)+" ");}System.out.println(list.get(list.size()-1));}}}

P2016.数据的交换输出

package hdu经典100题;import java.util.Scanner;public class P2016 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();if(n==0) {break;}int[] nums = new int [n];nums[0] = in.nextInt();int minIndex = 0;int temp;for (int i = 1; i < nums.length; i++) {nums[i] = in.nextInt();if(nums[i]<nums[minIndex]) {minIndex = i;}}temp = nums[minIndex];nums[minIndex] = nums[0];nums[0] = temp;for (int i = 0; i < nums.length-1; i++) {System.out.print(nums[i]+" ");}System.out.println(nums[nums.length-1]);}}
}

P2017.字符串统计

package hdu经典100题;import java.util.Scanner;public class P2017 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int n = in.nextInt();while(n!=0) {String str = in.next().toLowerCase();int amount =0;for (int i = 0; i < str.length(); i++) {if(str.charAt(i)>='0' && str.charAt(i)<='9') {amount++;}}System.out.println(amount);n--;}}}

P2018.母牛的故事

package hdu经典100题;import java.util.Scanner;public class P2018 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);long[] amount = new long [54];amount[0] = 1;amount[1] = 2;amount[2] = 3;amount[3] = 4;for (int i = 4; i < amount.length; i++) {amount[i] = amount[i-1]+amount[i-3];}while(in.hasNext()) {int n = in.nextInt();if(n==0) {break;}System.out.println(amount[n-1]);}}}

P2019.数列有序!

package hdu经典100题;import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;public class P2019 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();int m = in.nextInt();if(n==0 && m==0) {break;}List<Integer> list = new ArrayList<>();int insert = n;boolean isJ = false;for (int i = 0; i < n; i++) {list.add(in.nextInt());if(list.get(i)>=m && !isJ) {insert = i;isJ = true;}}list.add(insert, m);for (int i = 0; i < list.size()-1; i++) {System.out.print(list.get(i)+" ");}System.out.println(list.get(list.size()-1));}}}

P2020.绝对值排序

package hdu经典100题;import java.util.Scanner;public class P2020 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();if(n==0) {break;}int[] nums = new int [n];for (int i = 0; i < nums.length; i++) {nums[i] = in.nextInt();}int temp;for (int i = 0; i < nums.length; i++) {for (int j = 0; j < nums.length-1-i; j++) {if(Math.abs(nums[j+1])>Math.abs(nums[j])) {temp = nums[j+1];nums[j+1] = nums[j];nums[j] = temp;}}}for (int i = 0; i < nums.length-1; i++) {System.out.print(nums[i]+" ");}System.out.println(nums[nums.length-1]);}}}

P2021.发工资咯：）

package hdu经典100题;import java.util.Scanner;public class P2021 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int[] coins = new int[] {100,50,10,5,2,1};while(in.hasNext()) {int n = in.nextInt();if(n==0) {break;}int sum = 0;while(n!=0) {int num = in.nextInt();while(num>0) {for (int i = 0; i < coins.length; i++) {if(num-coins[i]>=0) {num = num - coins[i];sum++;break;}}}n--;}System.out.println(sum);}}
}

P2022.海选女主角

package hdu经典100题;import java.util.Scanner;public class P2022 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int m = in.nextInt();int n = in.nextInt();int[][] grades = new int[m][n];for (int i = 0; i < grades.length; i++) {for (int j = 0; j < grades[i].length; j++) {grades[i][j] = in.nextInt();}}int maxX = 0;int maxY = 0;for (int i = 0; i < grades.length; i++) {for (int j = 0; j < grades[i].length; j++) {if(Math.abs(grades[i][j])>Math.abs(grades[maxX][maxY])) {maxX = i;maxY = j;}}}System.out.println((maxX+1)+" "+(maxY+1)+" "+grades[maxX][maxY]);}}}

P2023.求平均成绩

package hdu经典100题;import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.Scanner;public class P2023 {public static void main(String[] args) {Scanner in=new Scanner(System.in);DecimalFormat df = new DecimalFormat("0.00");df.setRoundingMode(RoundingMode.HALF_UP);while(in.hasNext()){int n = in.nextInt();int m = in.nextInt();if (n == 0 && m == 0) break;int students[][] = new int[n][m];double classes [] = new double[m];for (int i = 0 ; i < n ; i ++){for (int k = 0 ; k < m ; k++) {Integer score = in.nextInt();students[i][k] = score;classes[k] += score;}}for (int i = 0 ; i < classes.length ; i ++) {classes[i] = classes[i] / n; //课程平均成绩}int count = 0;String studentAvg ="";String classAvg = "";for (int i = 0 ; i < n ; i ++) {double sum = 0;boolean excellentFlag = true;for (int k = 0 ; k < m ; k ++) {sum += students[i][k];if (students[i][k] < classes[k]) {excellentFlag = false;}}if (excellentFlag) {count ++;}studentAvg += df.format(sum / m) + " ";}for (int i = 0 ; i < m ; i ++) {classAvg += df.format(classes[i]) + " ";}System.out.println(studentAvg.trim());System.out.println(classAvg.trim());System.out.println(count);System.out.println();}}
}

P2024.C语言合法标识符

package hdu经典100题;import java.util.Scanner;public class P2024 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int n = in.nextInt();in.nextLine();while(n!=0) {boolean isHf = true;String str = in.nextLine().toLowerCase();if((str.charAt(0)<'a' || str.charAt(0)>'z') && !(str.charAt(0)=='_')) {isHf = false;}else {if(     str.equals("main") ||str.equals("float") || str.equals("auto") ||str.equals("break") ||str.equals("case") ||str.equals("this") ||str.equals("try") ||str.equals("for") ||str.equals("while") ||str.equals("int") ||str.equals("char") ||str.equals("short") ||str.equals("unsigned") ||str.equals("printf") ||str.equals("scanf")) {isHf = false;}else {for (int i = 1; i < str.length(); i++) {if(str.charAt(i)>='a' && str.charAt(i)<='z') {continue;}else if(str.charAt(i)>='0' && str.charAt(i)<='9'){continue;}else if(str.charAt(i)=='_') {continue;}else {isHf = false;break;}}}}if(isHf) {System.out.println("yes");}else {System.out.println("no");} n--;}}}

P2025.查找最大元素

package hdu经典100题;import java.util.Scanner;public class P2025 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while (in.hasNext()) {StringBuffer str = new StringBuffer("");str.append(in.next());char maxWord = str.charAt(0);for (int i = 0; i < str.length(); i++) {if (str.charAt(i) > maxWord) {maxWord = str.charAt(i);}}int[] maxNum = new int[100];int j = 0;for (int i = 0; i < str.length(); i++) {if (str.charAt(i) == maxWord) {maxNum[j++] = i;}}for (int i = 0; i < str.length(); i++) {int k;for (k = 0; k < j; k++) {if (maxNum[k] == i) {System.out.print(str.charAt(i) + "(max)");break;}}if (k == j) {System.out.print(str.charAt(i));}}System.out.println();}}
}

P2026.首字母变大写

package hdu经典100题;import java.util.Scanner;public class P2026 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {StringBuffer buffer = new StringBuffer(in.nextLine());buffer.setCharAt(0, (char)(buffer.charAt(0)-32));for (int i = 1; i < buffer.length()-1; i++) {if(buffer.charAt(i)==' ') {buffer.setCharAt(i+1, (char)(buffer.charAt(i+1)-32));}}System.out.println(buffer.toString());}}}

P2027.统计元音

package hdu经典100题;import java.util.Scanner;public class P2027 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int n = in.nextInt();in.nextLine();while (n != 0) {int[] nums = new int[5];String str = in.nextLine().toLowerCase();for (int i = 0; i < str.length(); i++) {switch (str.charAt(i)) {case 'a':nums[0]++;break;case 'e':nums[1]++;break;case 'i':nums[2]++;break;case 'o':nums[3]++;break;case 'u':nums[4]++;break;}}for (int i = 0; i < nums.length; i++) {switch (i) {case 0:System.out.println("a:"+nums[i]);break;case 1:System.out.println("e:"+nums[i]);break;case 2:System.out.println("i:"+nums[i]);break;case 3:System.out.println("o:"+nums[i]);break;case 4:System.out.println("u:"+nums[i]);break;}}if((n-1)!=0)System.out.println();n--;}}}

P2028.Lowest Common Multiple Plus

package hdu经典100题;import java.util.Arrays;
import java.util.Scanner;
/***     使用最大数翻倍法*  @author Geek*  @version 1.0*  @date 2018年8月7日 下午12:41:52*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2028 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();int[] nums = new int[n];for (int i = 0; i < nums.length; i++) {nums[i] = in.nextInt();}Arrays.sort(nums);int result = 1;for (int i = 1;; i++) {int j=0;for (j = 0; j < nums.length-1; j++) {if(i*nums[nums.length-1]%nums[j]!=0) {break;}}if(j==nums.length-1) {result = i*nums[nums.length-1];break;}}System.out.println(result);}    }}

P2029.Palindromes _easy version

package hdu经典100题;import java.util.Scanner;public class P2029 {public static boolean isHw(String str) {boolean isTrue = true;for (int i = 0; i < str.length()/2; i++) {if(str.charAt(i)!=str.charAt(str.length()-i-1)) {isTrue = false;break;}}return isTrue;}public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int n = in.nextInt();in.nextLine();while(n!=0) {String str = in.nextLine();if(isHw(str)) {System.out.println("yes");}else {System.out.println("no");}n--;}}
}

P2030.汉字统计

package hdu经典100题;import java.util.Scanner;
/***    不是可显示字符的就是汉字*   @author Geek*  @version 1.0*  @date 2018年8月7日 下午7:57:07* @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2030 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int n = in.nextInt();in.nextLine();while(n!=0) {String str = in.nextLine();int sum = 0;for (int i = 0; i < str.length(); i++) {if((int)str.charAt(i)<0 || (int)str.charAt(i)>127) {sum++;}}System.out.println(sum);n--;}}}

P2031.进制转换

package hdu经典100题;import java.util.Scanner;public class P2031 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int N = in.nextInt();int R = in.nextInt();System.out.println(Integer.toString(N, R).toString().toUpperCase());}}}

P2032.杨辉三角

package hdu经典100题;import java.util.Scanner;public class P2032 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);while (sc.hasNext()) {int n = sc.nextInt();int t = 0;int[][] arr = new int[30][30];arr[0][0] = 1;arr[0][1] = 1;arr[1][1] = 1;if (t > 0) {System.out.println();}for (int i = 0; i < n; i++) {// 层数arr[i][0] = 1;arr[i][n - 1] = 1;for (int j = 0; j <= i; j++) {// 第几个if (i == 0) {System.out.print("1");break;} else {if (i == 1) {System.out.print("1" + " " + "1");break;} else {if (j == 0) {arr[i][j] = 1;System.out.print(arr[i][j] + " ");}if (j >= 1 && j < i) {arr[i][j] = arr[i - 1][j - 1] + arr[i - 1][j];System.out.print(arr[i][j] + " ");}if (j == i) {arr[i][j] = 1;System.out.print("1");}}}}System.out.println();}System.out.println();t++;}}
}

P2033.人见人爱A+B

package hdu经典100题;import java.util.Scanner;public class P2033 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int N = in.nextInt();while (N != 0) {int[] times = new int[6];for (int i = 0; i < times.length; i++) {times[i] = in.nextInt();}int[] sumtimes = new int[3];if (times[2] + times[5] > 59) {sumtimes[2] = times[2] + times[5] - 60;times[1]++;} else {sumtimes[2] = times[2] + times[5];}if (times[1] + times[4] > 59) {sumtimes[1] = times[1] + times[4] - 60;times[0]++;} else {sumtimes[1] = times[1] + times[4];}sumtimes[0] = times[0] + times[3];for (int i = 0; i < sumtimes.length-1; i++) {System.out.print(sumtimes[i] + " ");}System.out.println(sumtimes[sumtimes.length-1]);N--;}}}

P2034.人见人爱A-B

package hdu经典100题;import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;public class P2034 {/*** 只属于集合A的元素不属于集合B的元素叫两个集合的差* @param args*/public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();int m = in.nextInt();if(n==0 && m==0) {break;}Set<Integer> set = new TreeSet<>();for (int i = 0; i < n; i++) {set.add(in.nextInt());}int[] nums = new int[m];for (int i = 0; i < nums.length; i++) {nums[i] = in.nextInt();}for (int i = 0; i < nums.length; i++) {if(set.contains(nums[i])) {set.remove(nums[i]);}}if(set.size()==0) {System.out.println("NULL");}else {for (int i:set) {System.out.print(i+" ");}System.out.println();}}}}

P2035.人见人爱A^B

package hdu经典100题;import java.math.BigInteger;
import java.util.Scanner;public class P2035 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {BigInteger A = in.nextBigInteger();int B = in.nextInt();if(A.toString().equals("0") && B==0) {break;}String str = A.pow(B).toString();if(str.length()-3>=0) {System.out.println(Integer.valueOf(str.substring(str.length()-3)));}else {System.out.println(str);}}}
}

P2037.今年暑假不AC

package hdu经典100题;import java.util.Scanner;
/***    贪心算法,把结束时间按升序排列,然后下一个开始时间如果比前一个结束时间大的话计数器就加1*   @author Geek*  @version 1.0*  @date 2018年8月9日 下午10:52:00*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2037 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();if(n==0) {break;}int[][] times = new int[n][2];for (int i = 0; i < times.length; i++) {for (int j = 0; j < times[i].length; j++) {times[i][j] = in.nextInt();}}int temp;for (int i = 0; i < times.length; i++) {for (int j = 0; j < times.length-i-1; j++) {if(times[j][1]>times[j+1][1]) {temp = times[j][1];times[j][1] = times[j+1][1];times[j+1][1] = temp;temp = times[j][0];times[j][0] = times[j+1][0];times[j+1][0] = temp;}}}int sum = 1;int k = 0;for (int i = 1; i < times.length; i++) {if(times[i][0]>=times[k][1]) {k = i;sum++;}}System.out.println(sum);}}}

P2038.test

//我没找到题目=-=

P2039.三角形

package hdu经典100题;import java.util.Scanner;
/***    题目的坑点就在于要定义一个实数*    @author Geek*  @version 1.0*  @date 2018年8月9日 下午10:10:35*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2039 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int M = in.nextInt();while(M!=0) {double A = in.nextDouble();double B = in.nextDouble();double C = in.nextDouble();if(A+B>C && B+C>A && C+A>B) {System.out.println("YES");}else {System.out.println("NO");}M--;}}}

P2040.亲和数

package hdu经典100题;import java.util.Scanner;public class P2040 {public static boolean isQhs(int A,int B) {int sum = 1;for (int i = 2; i < Math.sqrt(A); i++) {if(A%i==0) {sum = sum+i+(A/i);}}if((int)Math.sqrt(A)*(int)Math.sqrt(A)==A) {sum+=Math.sqrt(A);}if(sum==B) {return true;}return false;}public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int M = in.nextInt();while(M!=0) {int A = in.nextInt();int B = in.nextInt();int temp;if(A>B) {temp = A;A = B;B = temp;}if(isQhs(A, B)) {System.out.println("YES");}else {System.out.println("NO");}M--;}}}

P2041.超级楼梯

package hdu经典100题;import java.util.Scanner;
/***    斐波那契数列*     @author Geek*  @version 1.0*  @date 2018年8月9日 下午10:55:46*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2041 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int N = in.nextInt();int [] jtNum = new int[40];jtNum[0] = 0;jtNum[1] = 1;jtNum[2] = 2;for (int i = 3; i < jtNum.length; i++) {jtNum[i] = jtNum[i-1]+jtNum[i-2];}while(N!=0) {int M = in.nextInt();System.out.println(jtNum[M-1]);N--;}}
}

P2042.不容易系列之二

package hdu经典100题;import java.util.Scanner;public class P2042 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int N = in.nextInt();while(N!=0) {int a = in.nextInt();int num = 3;while(a!=0) {num = 2*(num-1);a--;}System.out.println(num);N--;}}
}

P2043.密码

package hdu经典100题;import java.util.Scanner;public class P2043 {private static void judge(String pwd) {boolean isSafe = true;if (pwd.length() < 8 || pwd.length() > 16) {isSafe = false;} else {int score = 0;if (pwd.matches(".*[A-Z]+.*")) // 大写字母score++;if (pwd.matches(".*[a-z]+.*")) // 小写字母score++;if (pwd.matches(".*[0-9]+.*")) // 数字score++;if (pwd.matches(".*[~!@#\\$%\\^]+.*")) // ~,!,@,#,$,%,^;score++;// 密码中的字符应该来自下面“字符类别”中四组中的至少三组if (score < 3)isSafe = false;}System.out.println(isSafe ? "YES" : "NO");}public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int M = in.nextInt();in.nextLine();while (M-- > 0)judge(in.nextLine());}}

P2044.一只小蜜蜂...

package hdu经典100题;import java.util.Scanner;public class P2044 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);long[] nums = new long[49];nums[0] = 1;nums[1] = 2;for (int i = 2; i < nums.length; i++) {nums[i] = nums[i-1]+nums[i-2];}int N = in.nextInt();while(N!=0) {int a = in.nextInt();int b = in.nextInt();System.out.println(nums[b-a-1]);N--;}}}

P2045.不容易系列之(3)—— LELE的RPG难题

递推分析

package hdu经典100题;import java.util.Scanner;public class P2045 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);long[] nums = new long[50];nums[0] = 3;nums[1] = 6;nums[2] = 6;for (int i = 3; i < nums.length; i++) {nums[i] = nums[i-1]+nums[i-2]*2;}while(in.hasNext()) {int n = in.nextInt();System.out.println(nums[n-1]);}}}

P2046.骨牌铺方格

package hdu经典100题;import java.util.Scanner;
/***    分析:*    1.如果最后一块是竖块,所有的可能就是前面n-1种*  2.如果最后一块是横块,那么所有可能就是前面的n-2种*    @author Geek*  @version 1.0*  @date 2018年8月11日 下午7:55:01*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2046 {public static void main(String[] args) {Scanner in = new Scanner(System.in);long[] nums = new long[50];nums[0] = 1;nums[1] = 2;nums[2] = 3;for (int i = 3; i < nums.length; i++) {nums[i] = nums[i-1]+nums[i-2];}while(in.hasNext()) {int n = in.nextInt();System.out.println(nums[n-1]);}}
}

P2047.阿牛的EOF牛肉串

package hdu经典100题;import java.util.Scanner;
/** 分析:*    1.如果最后一个字母是E或者F,那么就有2*(n-1)种可能*     2.如果最后一个字母是O的话,那么倒数第二个字母可能是E或者F,那么就有就有2*(n-2)种可能*   @author Geek*  @version 1.0*  @date 2018年8月11日 下午8:21:45*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2047 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);long[] nums = new long[39];nums[0]=3;nums[1]=8;for (int i = 2; i < nums.length; i++) {nums[i] = 2*(nums[i-1]+nums[i-2]);}while(in.hasNext()) {int n = in.nextInt();System.out.println(nums[n-1]);}}}

P2048.神、上帝以及老天爷

错排公式的分析

package hdu经典100题;import java.text.DecimalFormat;
import java.util.Scanner;
/***    使用错排公式f[n]=(n-1)*(f[n-1]+f[n-2])*     @author Geek*  @version 1.0*  @date 2018年8月11日 下午9:55:32*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2048 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int C = in.nextInt();DecimalFormat decimalFormat = new DecimalFormat("0.00%");double[] nums = new double[21];nums[2] = 1;nums[3] = 2;for (int i = 4; i < nums.length; i++) {nums[i] = (i-1)*(nums[i-1]+nums[i-2]);}while(C!=0) {int n = in.nextInt();double jc = 1;for (int i = 2; i < n+1; i++) {jc*=i;}System.out.println(decimalFormat.format(nums[n]/jc));C--;}}
}

P2049.不容易系列之(4)——考新郎

package hdu经典100题;import java.util.Scanner;
/***    不要忘记组合中的错排了*    @author Geek*  @version 1.0*  @date 2018年8月30日 上午9:34:43*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2049 {public static void main(String[] args) {Scanner in = new Scanner(System.in);long[] nums = new long[21];nums[2] = 1;nums[3] = 2;for (int i = 4; i < nums.length; i++) {nums[i] = (i - 1) * (nums[i - 1] + nums[i - 2]);}int C = in.nextInt();while (C != 0) {int M = in.nextInt();int N = in.nextInt();if (M == N) {System.out.println(nums[N]);} else {long resultTop = 1;long resultDown = 1;for (int i = M; i > N; i--) {resultTop *= i;}for (int i = 1; i <= (M - N); i++) {resultDown *= i;}System.out.println(nums[N] * resultTop / resultDown);}C--;}}
}

P2050.折线分割平面

package hdu经典100题;import java.util.Scanner;public class P2050 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int C = in.nextInt();long[] nums = new long[10000];nums[0]=2;nums[1]=7;long k = 5;for (int i = 2; i < nums.length; i++) {nums[i] = nums[i-1]+(k+4);k=k+4;}while(C!=0) {int n = in.nextInt();System.out.println(nums[n-1]);C--;}}
}

P2051.Bitset

package hdu经典100题;import java.util.Scanner;public class P2051 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {System.out.println(Integer.toString(in.nextInt(), 2));}}}

P2052.Picture

package hdu经典100题;import java.util.Scanner;public class P2052 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNext()) {int weight = in.nextInt();int height = in.nextInt();for (int i = 0; i < height+2; i++) {if(i==0 || i==height+1) {System.out.print("+");for (int j = 0; j < weight; j++) {System.out.print("-");}System.out.println("+");}else {System.out.print("|");for (int j = 0; j < weight; j++) {System.out.print(" ");}System.out.println("|");}}System.out.println();}}
}

P2053.Switch Game

package hdu经典100题;import java.util.Scanner;public class P2053 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();int zt = 0;for (int i = 1; i <=n; i++) {if(n%i==0) {if(zt==1) {zt=0;}else {zt=1;}}}System.out.println(zt);}}
}

P2054.A == B ?

package hdu经典100题;import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Scanner;
/***    坑B,忘记了精度*   @author Geek*  @version 1.0*  @date 2018年8月12日 下午9:53:23*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2054 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNext()) {BigDecimal A = in.nextBigDecimal();BigDecimal B = in.nextBigDecimal();if(A.compareTo(B)==0) {System.out.println("YES");}else {System.out.println("NO");}}}
}

P2055.An easy problem

package hdu经典100题;import java.util.Scanner;public class P2055 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int T = in.nextInt();while(T!=0) {char c = in.next().charAt(0);int num = in.nextInt();if(c>='A' && c<='Z') {System.out.println((c-64+num));}else if(c>='a' && c<='z') {System.out.println(-(c-96)+num);}T--;}}
}

P2057.A + B Again

package hdu经典100题;import java.util.Scanner;public class P2057 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {String A = in.next();String B = in.next();System.out.println(Long.toString(Long.valueOf(A, 16)+Long.valueOf(B, 16), 16).toUpperCase());}}}

P2058.The sum problem

解题传送门

package hdu经典100题;import java.util.Scanner;public class P2058 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {long N = in.nextLong();long M = in.nextLong();if(N==0 && M==0) {break;}         for (long i = (long) Math.sqrt(2*M); i>0; i--) {N = ((2*M)/i+1-i)/2;if((2*N+i-1)*i/2==M) {System.out.println("["+N+","+(N+i-1)+"]");}}System.out.println();}}}

P2070.Fibbonacci Number

package hdu经典100题;import java.util.Scanner;public class P2070 {public static void main(String[] args) {Scanner in = new Scanner(System.in);long[] nums = new long[51];nums[0] = 0;nums[1] = 1;for (int i = 2; i < nums.length; i++) {nums[i] = nums[i-1]+nums[i-2];}while(in.hasNext()) {int n = in.nextInt();if(n==-1) {break;}System.out.println(nums[n]);}}
}

P2071.Max Num

package hdu经典100题;import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;public class P2071 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int n = in.nextInt();List<Double> list = new ArrayList<>();DecimalFormat decimalFormat = new DecimalFormat("0.00");while(n!=0) {int k = in.nextInt();for (int i = 0; i < k; i++) {list.add(in.nextDouble());}Collections.sort(list);System.out.println(decimalFormat.format(list.get(list.size()-1)));list.clear();n--;}}
}

P2072.单词数

package hdu经典100题;import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;public class P2072 {public static void main(String[] args) {Scanner in = new Scanner(System.in);Set<String> set = new TreeSet<>();while(in.hasNext()) {String str = in.nextLine();if(str.equals("#")) {break;}String[] s = str.split(" ");for (String string : s) {if(!string.equals("")) {set.add(string);}}System.out.println(set.size());set.clear();}}
}

P2073.无限的路

分析传送门

package hdu经典100题;import java.text.DecimalFormat;
import java.util.Scanner;public class P2073 {private static final double sqrt2 = Math.sqrt(2);public static void main(String[] args) {Scanner in = new Scanner(System.in);double[] nums = new double[201];nums[0] = 0;nums[1] = 1;for (int i = 2; i < nums.length; i++) {nums[i] = nums[i-1]+(i-1)*(sqrt2)+Math.sqrt(Math.pow(i, 2)+Math.pow(i-1, 2));}DecimalFormat format = new DecimalFormat("0.000");int n = in.nextInt();while(n!=0) {double x1 = in.nextDouble();double y1 = in.nextDouble();double x2 = in.nextDouble();double y2 = in.nextDouble();double sum1 = nums[(int) (x1+y1)]+Math.sqrt(Math.pow(x1, 2)+Math.pow(x1, 2));double sum2 = nums[(int) (x2+y2)]+Math.sqrt(Math.pow(x2, 2)+Math.pow(x2, 2));System.out.println(format.format(Math.abs(sum2-sum1)));n--;}}
}

P2074.叠筐

分析传送门

package hdu经典100题;import java.util.Scanner;public class P2074 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int count = 0;while (in.hasNext()) {int n = in.nextInt();if(count!=0) {System.out.println();}char centerChar = in.next().charAt(0);char outChar = in.next().charAt(0);if(n==1) {System.out.println(centerChar);continue;}String[] dk = new String[(n + 1) / 2];char temp;if (((n + 1) / 2) % 2 == 0) {temp = centerChar;centerChar = outChar;outChar = temp;}StringBuilder builder = new StringBuilder();for (int i = 0; i < n; i++) {if (i == 0 || i == n - 1) {builder.append(" ");} else {builder.append(centerChar);}}dk[0] = builder.toString();StringBuilder stringBuilder = new StringBuilder();for (int i = 0; i < n; i++) {if (i == 0 || i == n - 1) {stringBuilder.append(centerChar);} else {stringBuilder.append(outChar);}}for (int i = 1; i < dk.length; i++) {if(i==1) {dk[i] = stringBuilder.toString();}else {StringBuilder str = new StringBuilder();char pj;if(i%2==0) {pj = centerChar;}else {pj = outChar;}for (int j = i; j < n-i; j++) {str.append(pj);}stringBuilder.replace(i, n-i, str.toString());dk[i] = stringBuilder.toString();}}for (int i = 0; i < dk.length; i++) {System.out.println(dk[i]);}for (int i = dk.length-2; i>=0; i--) {System.out.println(dk[i]);}count++;}}
}

P2075.A|B?

package hdu经典100题;import java.math.BigInteger;
import java.util.Scanner;public class P2075 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int T = in.nextInt();BigInteger A;BigInteger B;while(T!=0) {A = in.nextBigInteger();B = in.nextBigInteger();if(A.mod(B).toString().equals("0")) {System.out.println("YES");}else {System.out.println("NO");}T--;}}
}

P2076.夹角有多大(题目已修改,注意读题)

package hdu经典100题;import java.util.Scanner;
/***    WA了好几次,终于发现了除的时候忘加了精度*  @author Geek*  @version 1.0*  @date 2018年8月15日 下午3:06:23*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2076 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int T = in.nextInt();while(T!=0) {int h = in.nextInt();int m = in.nextInt();int s = in.nextInt();if(h>=12) {h = h-12;}double jj1 = 30*h+0.5*m+s/120.0;double jj2 = m*6+0.1*s;double k = Math.abs(jj1-jj2);if(k>180) {k=360-k;}System.out.println((int)k);T--;}}
}

P2080.夹角有多大II

package hdu经典100题;import java.text.DecimalFormat;
import java.util.Scanner;public class P2080 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int T = in.nextInt();DecimalFormat format = new DecimalFormat("0.00");while(T!=0) {double x1 = in.nextDouble();double y1 = in.nextDouble();double x2 = in.nextDouble();double y2 = in.nextDouble();double jj1 = 0;double jj2 = 0;if(x1==0 && y1>0) {jj1 = 90;}else if (x1==0 && y1<0) {jj1 = 270;}else if (y1==0 && x1>0) {jj1 = 0;}else if (y1==0 && x1<0) {jj1 = 180;}else if (x1<0 && y1>0 || x1<0 && y1<0) {jj1 = 180+Math.toDegrees(Math.atan(y1/x1));}else if (x1>0 && y1<0) {jj1 = 360+Math.toDegrees(Math.atan(y1/x1));}else {jj1 = Math.toDegrees(Math.atan(y1/x1));}if(x2==0 && y2>0) {jj2 = 90;}else if (x2==0 && y2<0) {jj2 = 270;}else if (y2==0 && x2>0) {jj2 = 0;}else if (y2==0 && x2<0) {jj2 = 180;}else if (x2<0 && y2>0 || x2<0 && y2<0) {jj2 = 180+Math.toDegrees(Math.atan(y2/x2));}else if (x1>0 && y1<0) {jj2 = 360+Math.toDegrees(Math.atan(y2/x2));}else {jj2 = Math.toDegrees(Math.atan(y2/x2));}double result = Math.abs(jj2-jj1);if(result>180) {result = 360-result;}System.out.println(format.format(result));T--;}}
}

P2081.手机短号

package hdu经典100题;import java.util.Scanner;public class P2081 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int N = in.nextInt();while(N!=0) {String str = in.next();System.out.println(6+str.substring(str.length()-5));N--;}}
}

P2085.核反应堆

package hdu经典100题;import java.util.Scanner;public class P2085 {public static void main(String[] args) {Scanner in = new Scanner(System.in);long[] numHigh = new long[34];long[] numLow = new long[34];numHigh[0] = 1;for (int i = 1; i < numLow.length; i++) {numHigh[i] = numHigh[i-1]*3+numLow[i-1]*2;numLow[i] = numHigh[i-1]+numLow[i-1];}while(in.hasNext()) {int n = in.nextInt();if(n==-1) {break;}System.out.println(numHigh[n]+", "+numLow[n]);}}
}

P2086.A1 = ?

分析传送门

package hdu经典100题;import java.text.DecimalFormat;
import java.util.List;
import java.util.Scanner;public class P2086 {public static void main(String[] args) {Scanner in = new Scanner(System.in);DecimalFormat format = new DecimalFormat("0.00");while(in.hasNext()) {int n = in.nextInt();double a0 = in.nextDouble();double anAdd1 = in.nextDouble();double[] nums = new double[n];for (int i = 0; i < nums.length; i++) {nums[i] = in.nextDouble();}double result = n*a0+anAdd1;int j = 2*n;for (int i = 0; i < nums.length; i++) {result = result - j*nums[i];j=j-2;}System.out.println(format.format(result/(n+1)));}}
}

P2087.剪花布条

package hdu经典100题;import java.util.Scanner;public class P2087 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while (in.hasNext()) {String str = in.next();if (str.equals("#")) {break;}String sub = in.next();int sum = 0;for (int i = 0; i < str.length(); i++) {if (i + sub.length() <= str.length()) {if (str.substring(i, i + sub.length()).equals(sub)) {sum++;i = i + sub.length()-1;}}}System.out.println(sum);}}
}

P2089.不要62

package hdu经典100题;import java.util.Scanner;
/***    MLE,搞了半天发现自己数组多打了一个1....然后内存就超了*    @author Geek*  @version 1.0*  @date 2018年8月19日 上午9:59:56*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2089 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);int[] nums = new int[1000001];for (int i = 0; i <nums.length; i++) {String str = String.valueOf(i);if(str.contains("4") || str.contains("62")) {nums[i] = 1;}}while(in.hasNext()) {int n = in.nextInt();int m = in.nextInt();if(n==0 && m==0) {break;}int sum = m-n+1;for (int i = n; i <=m; i++) {if(nums[i]==1) {sum--;}}System.out.println(sum);}}}

P2090.算菜价

package hdu经典100题;import java.text.DecimalFormat;
import java.util.Scanner;public class P2090 {public static void main(String[] args) {Scanner in = new Scanner(System.in);double sum = 0;DecimalFormat format = new DecimalFormat("0.0");while(in.hasNext()) {String str = in.next();double num = in.nextDouble();double price = in.nextDouble();sum+=num*price;}System.out.println(format.format(sum));}
}

P2091.空心三角形

package hdu经典100题;import java.util.Scanner;
/***    题面可能描述的有问题???输入的第一个测试与打印直接没有空格,其他都有*    @author Geek*  @version 1.0*  @date 2018年8月21日 下午9:10:43*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2091 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int sum = 0;while(in.hasNext()) {char c = in.next().charAt(0);if(c=='@') {break;}int n = in.nextInt();sum++;if(sum!=1) {System.out.println();}for (int i = 0; i < n; i++) {       if(i==n-1) {for (int j = 0; j < 2*n-1; j++) {System.out.print(c);}System.out.println();}else if (i==0) {for (int j = 0; j < n-1-i; j++) {System.out.print(" ");}System.out.println(c);}else {for (int j = 0; j < n-1-i; j++) {System.out.print(" ");}System.out.print(c);for (int j = 0; j < 2*i-1; j++) {System.out.print(" ");}System.out.println(c);}}}}
}

P2092.整数解

package hdu经典100题;import java.util.Scanner;public class P2092 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNext()) {int sum = in.nextInt();int cj = in.nextInt();if(sum==0 && cj==0) {break;}if(Math.pow(sum, 2)-4*cj>=0) {double result = -sum+Math.sqrt(Math.pow(sum, 2)-4*cj);if(result%2==0) {System.out.println("Yes");}else{System.out.println("No");}      }else {System.out.println("No");}}}
}

P2094.产生冠军

package hdu经典100题;import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;public class P2094 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {Set<String> setA = new TreeSet<>();Set<String> set = new TreeSet<>();int n = in.nextInt();if(n==0) {break;}for (int i = 0; i < n; i++) {String winer = in.next();String loser = in.next();set.add(winer);set.add(loser);setA.add(loser);}if(setA.size()==set.size()-1) {System.out.println("Yes");}else {System.out.println("No");}}}}

P2095.find your present (2)

具体分析

package hdu经典100题;import java.util.Scanner;public class P2095 {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNext()) {int n = in.nextInt();if(n==0) {break;}int result = 0;for (int i = 0; i < n; i++) {result^=in.nextInt();}System.out.println(result);}}
}

P2096.小明A+B

package hdu经典100题;import java.util.Scanner;
/***    题意有问题*  @author Geek*  @version 1.0*  @date 2018年8月15日 下午6:14:48*    @TextDemo I hava a acDream*    @copyright *   @remark*/
public class P2096 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int T = in.nextInt();while(T!=0) {int A = in.nextInt()%100;int B = in.nextInt()%100;System.out.println((A+B)%100);        T--;}}
}

P2097.Sky数

package hdu经典100题;import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;public class P2097 {static Map<Character, Integer> map = new HashMap<>();public static boolean isSky(int num) {int k = num;int sumTen = 0;//10进制while(k!=0) {sumTen+=k%10;k=k/10;}//十六进制String hash = Integer.toHexString(num).toUpperCase();int sumHash = 0;for (int i = 0; i < hash.length(); i++) {sumHash+=map.get(hash.charAt(i));}//十二进制String teString = Integer.toString(num, 12).toUpperCase();int sumTe = 0;for (int i = 0; i < teString.length(); i++) {sumTe+=map.get(teString.charAt(i));}if(sumTen==sumHash && sumTen==sumTe) {return true;}return false;}public static void main(String[] args) {Scanner in = new Scanner(System.in);map.put('0', 0);map.put('1', 1);map.put('2', 2);map.put('3', 3);map.put('4', 4);map.put('5', 5);map.put('6', 6);map.put('7', 7);map.put('8', 8);map.put('9', 9);map.put('A', 10);map.put('B', 11);map.put('C', 12);map.put('D', 13);map.put('E', 14);map.put('F', 15);while(in.hasNext()) {int num = in.nextInt();if(num==0) {break;}if (isSky(num)) {System.out.println(num+" is a Sky Number.");}else {System.out.println(num+" is not a Sky Number.");}}}
}

P2098.分拆素数和

package hdu经典100题;import java.util.Arrays;
import java.util.Scanner;public class P2098 {public static void main(String[] args) {Scanner in = new Scanner(System.in);int[] nums = new int[10001];nums[0] = 1;nums[1] = 1;nums[2] = 0;nums[3] = 0;nums[5] = 0;for (int i = 2; i < nums.length; i++) {if(nums[i]==0) {for (int j = 2; i*j < nums.length; j++) {nums[i*j] = 1;}}}while(in.hasNext()) {int num = in.nextInt();int sum = 0;if(num==0) {break;}for (int i = 2; i <num/2; i++) {if(nums[i]==0 && nums[num-i]==0) {sum++;}}System.out.println(sum);}}
}

P2099.整除的尾数

package hdu经典100题;import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;public class P2099 {public static void main(String[] args) {// TODO Auto-generated method stubScanner in = new Scanner(System.in);while(in.hasNext()) {List<String> list = new ArrayList<>();long A = in.nextLong();long B = in.nextLong();if(A==0 && B==0) {break;}for (int i = 0; i < 100; i++) {String s;if(i<10) {s = "0"+i;}else {s = String.valueOf(i);}if(Long.valueOf((A+s))%B==0) {list.add(s);}}for (int i = 0; i < list.size()-1; i++) {System.out.print(list.get(i)+" ");}System.out.println(list.get(list.size()-1));}}}

未完......(更新中)

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