题解 | #牛牛的金币#

#include <stdio.h>

int main() {
    int x, x1, y, y1;
    scanf("%d %d",&x,&y);
    scanf("%d %d",&x1,&y1);
    int upAndDown = y1 - y;
    int leftAndRight = x1 - x;
    switch (upAndDown) 
    {
        case 1:
            printf("u");
            return 0;
        case -1:
            printf("d");
            return 0;
    }
    switch (leftAndRight) 
    {
        case 1:
            printf("r");
            return 0;
        case -1:
            printf("l");
            return 0;
    }

    return 0;
}