Submission #769089

#	Time	Username	Problem	Language	Result	Execution time	Memory
769089		t6twotwo	Connecting Supertrees (IOI20_supertrees)	C++17	19 / 100	160 ms	24088 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
int construct(std::vector<std::vector<int>> a) {
    int N = a.size();
    vector<vector<int>> s(N);
    vector<bool> vis(N);
    for (int i = 0; i < N; i++) {
        if (vis[i]) {
            continue;
        }
        vis[i] = 1;
        queue<int> q;
        q.push(i);
        while (!q.empty()) {
            int x = q.front();
            q.pop();
            s[i].push_back(x);
            for (int y = 0; y < N; y++) {
                if (!vis[y] && a[x][y]) {
                    vis[y] = 1;
                    q.push(y);
                }
            }
        }
    }
    vector ans(N, vector<int>(N));
    for (auto &v : s) {
        if (v.size() <= 1) {
            continue;
        }
        if (v.size() == 2) {
            return 0;
        }
        for (int i = 0; i < v.size(); i++) {
            for (int j = i + 1; j < v.size(); j++) {
                if (!a[v[i]][v[j]]) {
                    return 0;
                }
            }
        }
        for (int i = 0; i < v.size(); i++) {
            int x = v[i];
            int y = v[i + 1 == v.size() ? 0 : i + 1];
            ans[x][y] = ans[y][x] = 1;
        }
    }
    build(ans);
    return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:35:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         for (int i = 0; i < v.size(); i++) {
      |                         ~~^~~~~~~~~~
supertrees.cpp:36:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |             for (int j = i + 1; j < v.size(); j++) {
      |                                 ~~^~~~~~~~~~
supertrees.cpp:42:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         for (int i = 0; i < v.size(); i++) {
      |                         ~~^~~~~~~~~~
supertrees.cpp:44:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |             int y = v[i + 1 == v.size() ? 0 : i + 1];
      |                       ~~~~~~^~~~~~~~~~~

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