Submission #424507

#	Time	Username	Problem	Language	Result	Execution time	Memory
424507		MrFrancho	Connecting Supertrees (IOI20_supertrees)	C++14	Compilation error	0 ms	0 KiB

supertrees

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

const int MAXN = 1000;

vector<vector<int>> connectedGroups;
bool vis[MAXN]{};
int N;

void DFS(int node, int cur, vector<vector<int>> &p) {
    connectedGroups[cur].push_back(node);
    vis[node] = true;

    for(int i = 0; i < N; i++) {
        if(i != node && p[node][i] == 1 && !vis[i])
            DFS(i,cur,p);
    }
}

int construct(vector<vector<int>> p) {
    N = p.size();
    vector<vector<int>> answer(N);
    cout << '.' << endl;

    for(int i = 0; i < N; i++) {
        for(int j = 0; j < N; j++) {
            answer[i].push_back(0);
            for(int k = 0; k < N; k++) {
                if (i != j && j != k && k != i &&
                    p[i][k] == 1 && p[j][k] == 1 && p[i][j] != 1)
                    return 0;
            }
        }
    }

    cout << '.' << endl;
    int c = 0;
    for (int i = 0; i < N; i++) {
        if(!vis[i]) {
            vector<int> emp;
            connectedGroups.push_back(emp);
            DFS(i,c,p);
            c++;
        }
    }
    cout << '.' << endl;

    for(int i = 0; i < connectedGroups.size(); i++) {
        cout << i << ":\n";
        for(auto x: connectedGroups[i])
            cout << x << endl;
    }

    for(auto v : connectedGroups) {
        for(int i = 1; i < (int)v.size(); i++) {
            answer[v[0]][v[i]] = 1;
        }
    }
    cout << '.' << endl;

    build(answer);
    return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for(int i = 0; i < connectedGroups.size(); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~~~~~~~~
supertrees.cpp:61:5: error: 'build' was not declared in this scope
   61 |     build(answer);
      |     ^~~~~