OJ Board

#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define fore(i,n) for(int i = 0; i< n ; i++ )
#define lop(i,n) for(int i = 1 ; i<=n ; i++ )
#define ops(i,n) for(int i = n-1 ; i>=0 ; i-- )
#define PI 3.141592653589793
#define mod 1000000007
#define inf 1000000000
using namespace ...