题解 | #牛牛的金币#

#include <stdio.h>

int main() {
    int x, y,x1,y1;
    scanf("%d %d",&x,&y);
    scanf("%d %d",&x1,&y1);
    if(x1-x != 0)
    {
        if(x1>x)
            printf("r");
        if(x1<x)
            printf("l");
    }
    if(y1-y != 0)
    {
        if(y1>y)
            printf("u");
        if(y1<y)
            printf("d");
    }
    return 0;
}