제출 #722114

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
722114		viwlesxq	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	24 ms	376 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"

using namespace std;

typedef int64_t ll;
typedef string str;

int findEgg(int n, vector <pair <int, int>> edges) {
  vector <int> g[n + 1];
  vector <int> path;
  for (auto [a, b] : edges) {
    g[a].push_back(b);
    g[b].push_back(a);
  }
  function <void(int, int)> dfs = [&](int v, int p) {
    path.push_back(v);
    for (int to : g[v]) {
      if (to == p) {
        continue;
      }
      dfs(to, v);
    }
  };
  dfs(1, -1);
  int l = 0, r = n - 1;
  while (l < r) {
    int mid = (l + r) >> 1;
    vector <int> nodes;
    for (int i = 0; i <= mid; ++i) {
      nodes.push_back(path[i]);
    }
    if (query(nodes)) {
      r = mid;
    } else {
      l = mid + 1;
    }
  }
  return path[l];
}

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