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Submission #640166

# Submission time Handle Problem Language Result Execution time Memory
640166 2022-09-13T18:55:04 Z perohero Easter Eggs (info1cup17_eastereggs) C++14
100 / 100
 15 ms 360 KB 
#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

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
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Number of queries: 4
2 Correct 1 ms 208 KB Number of queries: 4
3 Correct 1 ms 208 KB Number of queries: 4
4 Correct 1 ms 208 KB Number of queries: 4

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 340 KB Number of queries: 8
2 Correct 11 ms 352 KB Number of queries: 9
3 Correct 14 ms 344 KB Number of queries: 9
4 Correct 15 ms 344 KB Number of queries: 9

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 356 KB Number of queries: 9
2 Correct 15 ms 348 KB Number of queries: 9
3 Correct 14 ms 348 KB Number of queries: 9
4 Correct 15 ms 360 KB Number of queries: 9