OJ Board

Hmm I used binary search together with DFS and got ElogE complexity.

#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <map>
#include <numeric>
#include <set>
#include <stack>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define FOR ...