text: #include <bits/stdc++.h>
  
  #define INF 0x3F3F3F3F
  #define LINF 0x3F3F3F3F3F3F3F3FLL
  #define DINF (double)1e+30
  
  #define forn(i, n) for ( int i = 0; i < (n); ++i )
  #define forxn(i, x, n) for ( int i = (x); i < (n); ++i )
  #define forr(i, a, b) for ( int i = (a); i <= (b); ++i )
  #define ford(i, a, b) for ( int i = (a); i >= (b); −−i )
  
  using namespace std;
  
  int main(){
  	
  
  	return 0;
  }