杭电-------2043密码（C语言写）

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

char a[50];
char b[7] = { '~','!','@','#','$','%','^' };
int c[4] = { 0 };
int main() {
    int m;
    scanf("%d", &m);
    int i, j;
    int flag;
    for (i = 0; i < m; i++) {
        scanf("%s", a);
        c[0] = 0;
        c[1] = 0;
        c[2] = 0;
        c[3] = 0;
        flag = 0;
        if (strlen(a) < 8 || strlen(a) > 16) {
            printf("NO
");
            continue;
        }
        for (j = 0; j < strlen(a); j++) {
            if (a[j] <= 'Z'&&a[j] >= 'A') { c[0]++; }
            if (a[j] <= 'z'&&a[j] >= 'a') { c[1]++; }
            if (a[j] <= '9'&&a[j] >= '0') { c[2]++; }
            if (strchr(b, a[j]) != NULL) { c[3]++; }
        }
        for (j = 0; j < 4; j++) {
            if (c[j] > 0) {
                flag++;
            }
        }
        if (flag >= 3) {
            printf("YES
");
        }
        else {
            printf("NO
");
        }
    }
    return 0;
}