OJ Board

my code is getting runtime error .. can some one tell me my problem plz
here is my code;

#include<iostream>
#include<stdlib.h>

using namespace std;

int main()
{
int n;
while(cin>>n)
{
int num[3001];
int num2[3001];
int num3[3001];
bool present[3000]={false};
int count=0;

for(int i=0; i ...