题解 | #牛牛的金币#

#include <stdio.h>

int main() 
{
    int x, y, x1, y1;
    while (scanf("%d %d\n%d %d", &x, &y, &x1, &y1) != EOF) 
    {
        if(x == x1)
        {
            if(y1 - y == 1)
             printf("u");
            if(y - y1 == 1)
             printf("d");
        }
        if(y == y1)
        {
            if(x1 - x == 1)
             printf("r");
            if(x - x1 == 1)
             printf("l");
        }
    }
    return 0;
}