每个字符对应唯一，忘了换行符的码了，故赋初值count为-1#include<stdio.h>int main(){ char num = 0,str[128] = {0}; int count = -1; while(scanf("%c",&num) != EOF){ str[(int)num-1] = 1;} for(int i = 0;i < 128;i++) { if(str[i] != 0) count++; } printf("%d",count); retu...
