缺省源（自用）

#include<bits/stdc++.h>
using namespace std;
#define endl '\n'
#define void inline void
// #define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
#define test(i) cout<<"test: "<<i<<endl
#define testp(i,j) cout<<i<<" "<<j<<endl
#define testd(i) cout<<i<<" "
#define end cout<<"\n"
#define div <<" "<<
#else
#define test(i)
#define testp(i,j)
#define testd(i)
#define end false
#define div ,
#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(){
	
}