题解 | #B题#

b题for循环

#include <stdio.h>
#include <string.h>

#define MAX_LEN 20000

int main() {
	char s[MAX_LEN];
	scanf("%s", s);
	int len = strlen(s);
	int min_count = len;
	
	for (char c1 = 'a'; c1 <= 'z'; c1++) {
		
		for (char c2 = 'a'; c2 <= 'z'; c2++) {
			int count = 0;
			
			for (int i = 0; i < len / 2; i++) {
				if (s[i] != c1) {
					count++;
				}
			}
			
			for (int i = len / 2; i < len; i++) {
				if (s[i] != c2) {
					count++;
				}
			}
			if (count < min_count) {
				min_count = count;
			}
		}
	}
	printf("%d\n", min_count);
	return 0;
}