题解 | 牛牛的字符矩形

#include <stdio.h>

int main() {
    char c;
    scanf("%c", &c);
    printf("%c%c%c\n"
           "%c%c%c\n"
           "%c%c%c\n",
           c, c, c,
           c, c, c,
           c, c, c);
    return 0;
}