leetcode每日一题27

263. 丑数

按题意写

class Solution {public:bool isUgly(int n) {if(!n)return false;while(n!=1){if(n%2&&n%3&&n%5){return false;}else if(n%2==0) {n/=2;continue;}else if(n%3==0){n/=3;continue;}else if(n%5==0){n/=5;continue;}}return true;}
};

要看题目给出的参数的取值范围的呀
否则每次写的题解都会被特殊的边缘值卡

268. 丢失的数字

我自己写的是哈希表的方法
不知道为什么这个写法

class Solution {public:int missingNumber(vector<int>& nums) {int n=nums.size()+1;int hash[n];for(int i=0;i<n-1;i++){int p=nums[i];hash[p]=1;}for(int i=0;i<n;i++){if(hash[i]!=1)return i;}return 1;}
};

在测试用例里是可以过的，但是在提交里的结果是最后返回的那个1
比如

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1,5946,5620,4435,4131,1941,1029,4860,4209,1391,326,6414,850,236,3905,5055,9851,8407,8391,3264,7398,4334,5348,4082,624,7121,8105,728,173,8054,4293,1717,4190,4715,6016,9236,3216,2296,7673,2353,8988,8777,8535,8977,6865,9614,4095,8933,8304,9263,2229,8929,2354,9732,824,1646,1599,6217,5571,4049,9158,8778,1415,8943,9937,9251,1120,7421,8632,1310,2779,1320,6201,1892,1693,3389,8605,1433,1814,2443,3102,1997,662,3340,5289,9817,4103,9218,8,3657,3225,2292,1428,1247,5307,4750,821,497,205,9586,4552,5726,6431,6180,3907,7877,8253,3922,8234,4863,6897,3980,9076,3818,6991,9260,8689,1136,2044,8344,2622,125,4626,9545,9880,7936,338,6300,5339,9883,6257,3515,8880,5514,4328,3933,5846,2504,638,403,8219,7336,1278,6961,7989,8816,3333,2873,1341,5750,1287,9194,2983,1302,9848,5318,4274,763,6272,6829,188,3458,5038,4482,9970,392,4079,7714,7800,9834,8110,1621,4956,6889,60,9669,4183,4162,4139,2820,7293,3169,3694,8873,5252,3800,6063,1134,9368,2169,9388,4812,5679,1606,3268,7582,9037,4300,5627,8851,1457,7720,140,4127,3044,2623,3608,4858,9312,3314,491,7770,5689,534,2036,8482,5180,6088,5330,7375,5382,1405,6657,1864,7241,4736,3682,8043,7034,9205,9109,8789,8119,9831,2411,1163,6864,7063,837,3830,4282,1847,99,5695,4486,9836,7559,8903,3145,9997,2251,1573,3973,3344,1974,2476,3638,1985,3866,6299,4509,9252,6899,2862,6695,8939,7643,7030,5414,3704,8195,7782,6429,1915,9783,8287,7234,1515,641,4395,8673,5804,1750,3545,9149,690,2701,9613,1091,7278,2176,5545,424,6268,5103,9729,7723,2620,9055,6817,639,4306,8736,3071,5549,1259,5126,6087,9901,5790,4416,8003,4696,2725,1784,583,3479,4867,9480,9692,9651,6756,1159,9322,5111,3551,8931,6983,9537,7634,8667,8289,2413,1059,2643,2094,4245,340,1253,6841,4539,8057,2361,1979,8500,922,7146,8839,510,7458,4230,5633,5334,7760,7152,4986,7286,2830,5245,8749,3737,2924,9265,7337,329,4089,7130,5379,2461,1292,2133,6094,6766,7013,5586,6540,7422,2211,9965,1289,9362,1824,395,6022,6515,4292,4000,5690,8986,2854,9629,2890,4697,5945,1567,2780,4964,6121,9084,2243,2662,1140,646,3136,9004,4531,5816,2384,1224,2559,7101,5910,8996,7822,2221,4720,8813,4656,6647,4628,1964,1874,6309,3886,1899,4193,8868,8620,291,8729,1756,9974,9284,3561,2914,9645,8056,6374,1916,8295,3848,3825,119,2539,2647,4302,4012,8181,5156,6673,1362,3120,2699,7157,4614,5416,1634,6337,7754,4425,3941,610,9853,8072,5364,7053,3294,6630,9554,3736,4383,9270,7373,9257,3261,741,2840,4875,3487,4535,4950,7651,7974,9753,1191,9533,1620,7632,964,6210,5955,5642,5538,3222,1478,8531,5222,8369,4405,7528,3592,8923,9998,3609,8274,6298,4057,5123,8493,230,1398,615,9741,2433,2898,2050,8806,1827,5754,9797,9148,9843,1891,5872,9387,9395,8423,5718,9119,6322,2949,7201,718,3447,3356,2580,7346,710,5854,58,9902,2471,3309,6421,706,3539,1254,1512,6686,9668,6497,3420,2882,4449,3945,3461,1414,6023,1109,5042,7935,6593,1894,7531,3257,3489,2813,3185,8751,1531,8508,5084,7773,7681,803,7103,148,6390,7545,9374,9897,3230,2523,7814,7270,7871,5866,5717,4018,5422,607,4927,3287,9360,3790,4961,9261,3269,1650,9671,7309,5427,5639,1698,9026,471,3017,6149,7579,8940,8830,2092,9656,7409,9190,2069,8040,7853,7891,301,2719,8015,6615,6555,5566,37,4529,1965,3923,8123,8132,5068,5899,3751,9287,4589,3398,3380,8639,7703,4815,2793,238,1665,8544,9483,4205,6561,671,7617,1580,8811,9777,3485,4272,6720,3311,8698,9202,807,8805,9877,7792,7511,4565,5536,4039,8547,5843,8792,3142,214,6263,937,6333,134,3467,452,8932,1654,4897,3559,3367,1689,7410,5212,9588,5391,7246,5039,7909,9214,3810,9774,1148,4192,6053,3919,554,3425,9440,8653,2576,7381,7599,2043,3995,3783,578,4194,2259,3189,840,796,6265,7669,9479,7277,343,2464,8901,1661,2286,1535,2515,1776,1358,149,663,6512,1394,7282,8238,7585,1486,9743,3392,480,8335,7743,8357,6335,2505,3316,7734,1595,5040,411,364,7390,8038,495,5122,4399,9298,6052,8016,9584,2167,4424,2152,5929,4137,990,4,6229,9425,789,731,9007,9707,8348,1002,1794,3133,8171,6425,3743,5217,3989,3056,7751,792,6372,5400,6102,90,2593,7178,7247,5175,8298,7218,8355,9323]

提交里返回的是1，测试里返回的是正确结果2492
连这么简单的题都能做错吗（绝望

官方题解的哈希法是放到set里做的

class Solution {public:int missingNumber(vector<int>& nums) {unordered_set<int> set;int n = nums.size();for (int i = 0; i < n; i++) {set.insert(nums[i]);}int missing = -1;for (int i = 0; i <= n; i++) {if (!set.count(i)) {missing = i;break;}}return missing;}
};

更简单的方法有

位运算
数组 nums 中有 n 个数，在这 n 个数的后面添加从 0 到 n 的每个整数，则添加了 n+1 个整数，共有 2n+1 个整数。
在 2n+1 个整数中，丢失的数字只在后面 n+1 个整数中出现一次，其余的数字在前面 n 个整数中（即数组中）和后面 n+1 个整数中各出现一次，即其余的数字都出现了两次。
根据出现的次数的奇偶性，可以使用按位异或运算得到丢失的数字。按位异或运算 ⊕ 满足交换律和结合律，且对任意整数 x 都满足 x⊕x=0 和 x⊕0=x。
由于上述 2n+1 个整数中，丢失的数字出现了一次，其余的数字都出现了两次，因此对上述 2n+1 个整数进行按位异或运算，结果即为丢失的数字。

class Solution {public:int missingNumber(vector<int>& nums) {int res = 0;int n = nums.size();for (int i = 0; i < n; i++) {res ^= nums[i];}for (int i = 0; i <= n; i++) {res ^= i;}return res;}
};

求和
0到n求和减去nums里所有数

class Solution {public:int missingNumber(vector<int>& nums) {int n = nums.size();int total = n * (n + 1) / 2;int arrSum = 0;for (int i = 0; i < n; i++) {arrSum += nums[i];}return total - arrSum;}
};

278. 第一个错误的版本

二分查找法

class Solution {public:int firstBadVersion(int n) {int left = 1, right = n;while (left < right) { // 循环直至区间左右端点相同int mid = left + (right - left) / 2; // 防止计算时溢出if (isBadVersion(mid)) {right = mid; // 答案在区间 [left, mid] 中} else {left = mid + 1; // 答案在区间 [mid+1, right] 中}}// 此时有 left == right，区间缩为一个点，即为答案return left;}
};

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leetcode每日一题27

263. 丑数

268. 丢失的数字

278. 第一个错误的版本

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