C语言中保留3位小数用%.3lf   用法:printf("%.3lf",result)

四边形分凸凹四边形。

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" alt="" />

提示都告诉你了

#include

using namespace std;

struct Point

{

float x, y;

};

float LinearIntegration(const Point &p1, const Point &p2)

{

return 0.5 * (p2.x - p1.x) * (p2.y + p1.y);

}

float ComputePolygonArea(const Point points[], int length)

{

if (points == NULL || length <= 0) return 0.0;

float area = 0.0;

for (int i = 0; i < length - 1; ++ i)

{

area += LinearIntegration(points[i], points[i + 1]);

}

area += LinearIntegration(points[length - 1], points[0]);

return area >= 0.0 ? area : -area;

}

int main()

{

int n;

Point a[4];

for(int i=0; i<4;i++) cin>>a[i].x>>a[i].y;

float ans = ComputePolygonArea(a,4);

printf("%.3f\n",ans);

return 0;

}

F: 进制转换

时间限制: 1 s      内存限制: 128 MB

题目描述

给定一个区间[l, r],从l至r之间的所有数依次转换成16进制然后连在一起,接着再转换成10进制,最后再对15取模。

输入

输入两个是l, r (1≤l≤r≤106)

输出

输出对15取模的结果。

样例输入

10 14

样例输出

0

提示

样例说明:

10、11、12、13、14的16进制分别是a、b、c、d、e。依次连在一起是abcde,转换成10进制是703710,对15取模为0。

一般的转化。(a*16^n+b*16^(n-1)..)%15,展开,a%16*16^n%15,16%15就可以不考虑了,于是变成a%15+b%15..。于是简化成a+b+c+d+e。注意取模

using System;

using System.Collections;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Reflection.Emit;

using System.Runtime.InteropServices;

public class Program

{

public static void Main()

{

var str = "";

List a = new List(Console.ReadLine().Split()).ConvertAll(i => int.Parse(i));

var sum = 0;

for (int i = a[0]; i <= a[1]; i++)

{

var pa = Convert.ToString(i, 16);

//var pa = Convert.ToInt32(x, 16).ToString();

var len = pa.Length;

for (int j = 0; j < len; j++)

{

if (pa[j] == 'a')

{

sum += (10);

sum %= 15;

}

else if (pa[j] == 'b')

{

sum += (11);

sum %= 15;

}

else if (pa[j] == 'c')

{

sum += (12);

sum %= 15;

}

else if (pa[j] == 'd')

{

sum += (13);

sum %= 15;

}

else if (pa[j] == 'e')

{

sum += (14);

sum %= 15;

}

else if (pa[j] == 'f')

{

sum += (15);

sum %= 15;

}

else

{

sum += int.Parse(pa[j].ToString());

sum %= 15;

}

}

}

Console.WriteLine(sum%15);

Console.ReadKey();

}

public static int ri() { return int.Parse(Console.ReadLine()); }

static int[] rla(char sep = ' ') { return Array.ConvertAll(Console.ReadLine().Split(sep), e =>int.Parse(e)); }

}

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