题解 | #牛牛的金币#

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
int main() {
    int x, y, x1, y1;
    scanf("%d %d\n", &x, &y);
    scanf("%d %d", &x1, &y1);
    if (abs(x1 - x) + abs(y1 - y) == 1) {
        if (y1 - y == 1) {
            printf("u");
        } else if (y - y1 == 1) {
            printf("d");
        } else if (x1 - x == 1) {
            printf("r");
        }   else if (x - x1 == 1) {
            printf("i");
        }

    }

return 0;
}