题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
#include <stdio.h> #include <string.h> int main() { char str[501]; int arr[128] = {0}; scanf("%s", str); int i = 0; for (i = 0; i < strlen(str); i++) { arr[str[i]]++; } int count = 0; for (i = 0; i < 128; i++) { if (arr[i] != 0) count++; } printf("%d", count); return 0; }