SF-Zhou

## 2017.netease.distribute.biscuit.cpp
#include <iostream>
#include <string>
#include <cstdio>
#include <cstring>
#include <vector>
#include <queue>
#include <cmath>
#include <unordered_map>
using namespace std;

## cf.449B.cpp
#include <iostream>
#include <cstdio>
#include <cstring>
#include <vector>
#include <queue>
using namespace std;

#define ff(i, n) for (int i = 0, END = (n); i < END; i ++)
#define fff(i, n, m) for (int i = (n), END = (m); i <= END; i ++)
#define dff(i, n, m) for (int i = (n), END = (m); i >= END; i --)
	#include <iostream>
	#include <string>
	#include <cstdio>
	#include <cstring>
	#include <vector>
	#include <queue>
	#include <cmath>
	#include <unordered_map>
	using namespace std;