Submission #941237

#	Time	Username	Problem	Language	Result	Execution time	Memory
941237		Numberz	Connecting Supertrees (IOI20_supertrees)	C++14	19 / 100	179 ms	22356 KiB

supertrees

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

int construct(vector<std::vector<int>> p) {
  //subtask 1
  int n = p.size();
  vector<vector<int>> res(n, vector<int>(n, 0));

  //checker
  vector<int> tracker(n, 0);
  
  vector<vector<int>> components;
  //checks if it is possible to build the bridges
  for (int i = 0; i < n; i++) {
    //checks if it should already be in a component
    bool search = true;
    
    for (int j = 0; j < components.size(); j++) {
      if (p[components[j][0]][i] == 2) {
        components[j].push_back(i);
        //cout << "prob first " << i << ' ' << j <<endl;
        //cout << "j: " << j << endl;
        tracker[i] = j;
        search = false;
        break;
      }
    }
    
    if (search) {
      components.push_back({i});
      //cout << "prob second " << i << ' ' << components.size()-1 <<endl;
      //cout << "comps: " << components.size() << endl;
      tracker[i] = components.size()-1;
    }
  }

  //check if wrong
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      if (i != j) {
        if ((tracker[i] == tracker[j] && p[i][j] == 0) || (tracker[i] != tracker[j] && p[i][j] != 0)) {
          return 0;
        } 
      }
    }
  }
  //within each component, build a graph
  // size shoud be > 1
  for (auto comp : components) {
    if (comp.size() > 1) {
      if (comp.size() == 2) {
        return 0;
      }
      int k = comp.size();
      for (int i = 0; i < k-1; i++) {
        res[comp[i]][comp[i+1]] = 1;
        res[comp[i+1]][comp[i]] = 1;
      }
      res[comp[k-1]][comp[0]] = 1;
      res[comp[0]][comp[k-1]] = 1;
    }
  }
  
  build(res);
  return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:19:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int j = 0; j < components.size(); j++) {
      |                     ~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 10
• Subtask 3: 19 / 19
• Subtask 4: 0 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4