OJ Board

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<queue>
#include<vector>
#include<stack>
#include<map>
#include<cctype>
#include<sstream>
#define L long long int
#define U unsigned long long int
#define INF 10000000
using namespace ...

#include<iostream>
#include<cstdio>
#include<cmath>
#include<vector>
#include<queue>
#include<stack>
#include<algorithm>
#include<cstring>
#include<map>
#include<sstream>
#define U unsigned long long int
#define L long long int
#define INF 12345678
#define NIL -1
#define LIM 1000

using namespace ...