Submission #649501

#	Time	Username	Problem	Language	Result	Execution time	Memory
649501		yelul	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	20 ms	468 KiB

eastereggs

#include "grader.h"
#include <bits/stdc++.h>
using namespace std;

vector<int> o;
vector<vector<int>> g(520);

void order(int x, int t) {
  o.push_back(x);
  for (int i : g[x]) {
    if (i == t)
      continue;
    order(i, x);
  }
}

int findEgg(int N, vector < pair < int, int > > bridges) {
  
  for (auto p : bridges) {
    int u = p.first, v = p.second;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  
  order(1, -1);

  int l = 0, r = N-2, mid, x = N-1;
  while (l <= r) {
    mid = (l+r)/2;
    vector<int> a;
    for (int i=0; i<=mid; i++)
      a.push_back(o[i]);
    if (query(a)) {
      r = mid-1;
      x = mid;
    } else {
      l = mid+1;
    }
  }

  int ans = o[x];
  o.clear();
  for (int i=0;i<=N;i++) 
    g[i].clear();
  
  return ans;
}

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