#include <iostream>
#include <cstdio>
using namespace std;

typedef long long Num;
typedef unsigned long long Unum;
typedef long double Lfloat;
#define Rint register int
#define It iterator
#define Os ostream
#define Is istream
#define Ifs ifstream
#define Ofs ofstream

#define AK_IOI bfw

template<typename T>/*T: integer type*/
void read(T& num)
{
    char ch;int f;num=0;while(1){ch=getchar();if(ch=='-' || (ch>='0'&&ch<='9')) break;} (ch=='-')?(f=-1):(f=1,num+=ch-'0');while(1){ch=getchar();if(!(ch=='-' || (ch>='0'&&ch<='9'))) break; num*=10;num+=ch-'0';} num*=f;
}

int main()
{
    return 0;
}

自带主函数 + 快读（int，long long 等均可使用，并支持负数） + 变量类型定义。