Submission #640166

#	Time	Username	Problem	Language	Result	Execution time	Memory
640166		tvladm2009	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	15 ms	360 KiB

eastereggs

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

using ll = long long;

const int MAX_N = 512;

std::vector<int> g[MAX_N + 1], v;

void dfs(int u, int p = -1) {
  v.push_back(u);
  for (int v : g[u]) {
    if (v != p) {
      dfs(v, u);
    }
  }
}

int bsearch() {
  int l = 0, r = v.size() - 1, sol = -1;
  while (r - l > 0) {
    int mid = (l + r) / 2;
    std::vector<int> tmp;
    for (int i = 0; i <= mid; i++) {
      tmp.push_back(v[i]);
    }
    if (query(tmp)) {
      r = mid;
      sol = mid;
    } else {
      l = mid + 1;
    }
  }
  return v[l];
}

int findEgg(int n, std::vector<std::pair<int, int>> bridges) {
  for (int i = 1; i <= n; i++) {
    g[i].clear();
  }
  for (auto it : bridges) {
    g[it.first].push_back(it.second);
    g[it.second].push_back(it.first);
  }
  v.clear();
  dfs(1);
  int answer = bsearch();
  return answer;
}

Compilation message (stderr)

eastereggs.cpp: In function 'int bsearch()':
eastereggs.cpp:20:32: warning: variable 'sol' set but not used [-Wunused-but-set-variable]
   20 |   int l = 0, r = v.size() - 1, sol = -1;
      |                                ^~~

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