Submission #300216

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
300216	2020-09-17T01:37:51 Z	madlogic	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KB

supertrees

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

using namespace std;

int construct(std::vector<std::vector<int>> p) {
  int n = p.size();
  vector<vector<int>> adj(n);
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) if (p[i][j]) {
      adj[i].push_back(j);
      adj[j].push_back(i);
    }
  }
  vector<int> cc;
  vector<bool> vis(n);
  function<void(int)> dfs = [&](int u) {
    vis[u] = true;
    cc.push_back(u);
    for (int to : adj[u]) if (!vis[to]) {
      dfs(to);
    }
  };
  vector<vector<int>> answer(n, vector<int>(n));
  for (int i = 0; i < n; i++) {
    if (!vis[i]) {
      dfs(i);
      int m = cc.size();
      int edges = 0;
      for (int p : cc)
        edges += adj[p].size();
      edges /= 2;
      if (edges >= m) 
        return 0;
      for (int j = 0; j < m - 1; j++)
        answer[cc[j]][cc[j + 1]] = answer[cc[j + 1]][cc[j]] = 1;
      cc.clear();
    }
  }
  for (int i = 0; i < n; i++)
    for (int j = 0; j < n; j++)
      if (p[i][j] == 0 && answer[i][j])
        return 0;
  build(answer);
  return 1;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<vector<int>> p(n, vector<int>(n));
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      cin >> p[i][j];
    }
  }
  construct(p);
  return 0;
}

Compilation message

/tmp/ccGbI3nE.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cc1HoFaN.o:supertrees.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status