預設源（自用）

#include<bits/stdc++.h>
using namespace std;
#define endl '\n'
#define void inline void
//#define ONLINE_JUDGE
#define nx <<
#define dev nx " " nx
#ifndef ONLINE_JUDGE
#define test(i) cout<<"test: "<<i<<endl
#else
#define test(i)
#endif
template<typename T>
void read(T& x){
	x=0;bool sym=0;char c=getchar();
    while(!isdigit(c)){sym^=(c=='-');c=getchar();}
    while(isdigit(c)){x=x*10+c-48;c=getchar();}
    if(sym)x=-x;
}
template<typename T,typename... Args>
void read(T& x,Args&... args){
    read(x);read(args...);
}
int main(){
	
}