测试样例可以过

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

int main() {
    int n;
    scanf("%d", &n);
    char s[1001][18];
    for (int i = 0; i < n; i++)
        scanf("%s", s[i]);
    for (int i = 0; i < n; i++) {
        int w = 0, z = 0;
        if (s[i][0] == 'D' && s[i][1] == 'X') 
            w = 1;
        for (int j = 0; j + 3 < strlen(s[i]); j++) {
            if (s[i][j] == s[i][j + 1] && s[i][j + 1] == s[i][j + 2] && s[i][j + 2] == s[i][j + 3]) {
                z = 1;
                break;
            }
        }
        if (w || z) {
            printf("Yes\n");
        } else {
            printf("No\n");
        }
    }
    return 0;
}