Find the Difference（类似 Single Number）

#include<stdio.h>#include<iostream>#include<string.h>char findTheDifference(char* s, char* t) {int i, j,s1=0,s2=0;for (i = 0; i < strlen(s)+1; i++){s1 += s[i];s2 += t[i];}return(char)(s2 - s1);}int main(){char *s = (char*)malloc(sizeof(char) * 100);char *t = (char*)malloc(sizeof(char) * 100);scanf("%s", s);//scanf("%s", t);随机产生char k;k = findTheDifference(s, t);printf("%c", k);system("pause");return 0;}

方法二：

char findTheDifference(char* s, char* t) {   char ss=0;int i, j;for (i = 0; i < strlen(s); i++){ss ^= s[i];}for (i = 0; i < strlen(s) + 1; i++){ss ^= t[i];}return ss;}

single number（只有一个出现奇数次）

nt singleNumber(int a[], int n) {       int num = 0;       for (int i = 0; i < n; ++i) {           num ^= a[i];       }       return num;      }