Submission #731299

#	Time	Username	Problem	Language	Result	Execution time	Memory
731299		TheSahib	Connecting Supertrees (IOI20_supertrees)	C++17	0 / 100	1 ms	296 KiB

supertrees

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

using namespace std;

const int MAX = 1005;
int par[MAX];

int find_set(int v){
    if(par[v] < 0) return v;
    return par[v] = find_set(par[v]);
}

bool unite(int u, int v){
    u = find_set(u);
    v = find_set(v);
    if(u == v) return false;

    par[u] += par[v];
    par[v] = u;
    return true;
}

int construct(vector<vector<int>> p) {
	int n = p.size();
    vector<vector<int>> ans(n, vector<int>(n));

    memset(par, -1, sizeof(par));
	for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            if(p[i][j] == 1){
                unite(i, j);
            }
        }
    }
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            if(i == j) continue;
            if(p[i][j] == 0 && find_set(i) == find_set(j)){
                return 0;
            }
        }
    }
    vector<int> comps[MAX];
    for (int i = 0; i < n; i++)
    {
        comps[find_set(i)].push_back(i);
    }
    for(auto& v:comps){
        for (int i = 0; i < v.size(); i++)
        {
            if(i != 0){
                ans[v[i]][v[i - 1]] = 1;
            }
            if(i != v.size() - 1){
                ans[v[i]][v[i + 1]] = 1;
            }
        }
        if(v.size() > 1){
            ans[v.front()][v.back()] = 1;
            ans[v.back()][v.front()] = 1;
        } 
    }
    
    build(ans);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:54:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |         for (int i = 0; i < v.size(); i++)
      |                         ~~^~~~~~~~~~
supertrees.cpp:59:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |             if(i != v.size() - 1){
      |                ~~^~~~~~~~~~~~~~~

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