#include<stdio.h>
#include<stdlib.h>

int main()
{
    int x,y,n,m;
    n = 10;
    m = 20;

    for (y = 0; y < m; y++){
        for (x = 0; x < n; x++){
            printf(rand() > RAND_MAX / 2 ? "／" : "＼");        
        }
        printf("\n");
    }
}