OJ Board

Hi everybody,
can anyone send some test cases to test my code, i get 6 WAs in my code and i don't know why
thanks in advance,

//My code
#include<iostream>
#include<vector>
#include<set>
using namespace std;

long mat[500][500];
vector<int> v[500];
int n,m;
long dist[500];
//int parent[500];
void ...