main.cpp

#include<bits/stdc++.h>
using namespace std;

#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);
#define endl '\n'

typedef long long ll;
typedef pair<int,int> pii;
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>
using namespace __gnu_pbds;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ost; // set
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_multiset; // multiset
*/

// direction array
int dx[]={1,-1,0,0};
int dy[]={0,0,1,-1};

// Bitmask

/*
bool check(int mask,int pos){return mask&(1<<pos);}
int SET(int mask,int pos){return mask|(1<<pos);}
int FLIP(int mask,int pos){return mask^(1<<pos);}
int reset(int mask,int pos){return mask&~(1 << pos);}


string to_bin(int mask)
{
	string str;
	for(int i=0;i<32;i++){
		str=str+(char)(check(mask,i)+'0');
	}
	return str;
}
*/

int main()
{

}