Submission #403590

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
403590	2021-05-13 09:51:19	hltk	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	24 ms	468 KiB

eastereggs

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#include <bits/stdc++.h>
using namespace std;
#include "grader.h"
int findEgg(int n, vector<pair<int, int>> bridges) {
  vector<vector<int>> g(n + 1);
  for (auto [a, b] : bridges) {
    g[a].push_back(b);
    g[b].push_back(a);
  }
  vector<int> ord;
  function<void(int, int)> dfs = [&](int v, int p) {
    ord.push_back(v);
    for (int u : g[v]) {
      if (u == p) continue;
      dfs(u, v);
    }
  };
  dfs(1, -1);
  int l = 0, r = (int) ord.size() - 1;
  while (l < r) {
    int m = (l + r) / 2;
    if (query({ord.begin(), ord.begin() + m + 1})) r = m;
    else l = m + 1;
  }
  return ord[l];
}
 
 
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• Subtask 1: 40 / 40
• Subtask 2: 40 / 40
• Subtask 3: 20 / 20