华为oj 统计字符串不同字符

#include <stdio.h>#include <string.h>int  firstSingle(char *str){int hash[128]={0};for(int i = 0 ;str[i];i++){hash[str[i]]++;}int cnt = 0;for(int i = 0;i < 128;i++){if(hash[i]!=0){cnt++;}}return cnt;}int main(void){char str[200]={'\0'};gets(str);int findout = firstSingle(str);printf("%d\n",findout);}