Submission #272162

#	Time	Username	Problem	Language	Result	Execution time	Memory
272162		erray	Easter Eggs (info1cup17_eastereggs)	C++17	0 / 100	2 ms	512 KiB

eastereggs

// author: erray
#include<bits/stdc++.h>
 
using namespace std;

int query(vector<int> v);

int findEgg(int n, vector<pair<int, int>> edges) {
  vector<vector<int>> g(n);
  for (auto e : edges) {
    g[e.first - 1].push_back(e.second - 1);
    g[e.second - 1].push_back(e.first - 1);
  }
  vector<int> ask;
  function<void(int, int)> dfs = [&](int v, int pr) {
    ask.push_back(v);
    for (auto u : g[v]) {
      if (u == pr) continue;
      dfs(u, v);
    }
  };
  int s = 0, e = n - 1;
  while (s != e) {
    int mid = (s + e) >> 1;
    vector<int> q;
    for (int i = 0; i <= mid; ++i) q.push_back(ask[i] + 1);
    if (query(q)) e = mid;
    else s = mid + 1;
  }
  return ask[s];
} 

• Subtask 1: 0 / 40
• Subtask 2: 0 / 40
• Subtask 3: 0 / 20