OJ Board

I'm new here. I kept getting "Runtime Error" all the time and I don't know why.
Could somebody please help me out here?
I really appreciate your help!!
#include <iostream>
using namespace std;
#define NLEN 66
#define MAX 259

char img[MAX][MAX];
int n = 0, m = 0;//size of area
char c_back;
void ...