Submission #996683

#	Time	Username	Problem	Language	Result	Execution time	Memory
996683		stdfloat	Thousands Islands (IOI22_islands)	C++17	1.75 / 100	25 ms	7628 KiB

islands

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

vector<vector<pair<int, int>>> E;

bool tr = false;

vector<bool> vis;

void dfs(int x, int p = -1) {
    vis[x] = true;
    for (auto [i, k] : E[x]) {
        if (i == p) continue;

        if (vis[i]) {
            if (!i) tr = true;
        }
        else dfs(i, x);
    }
}

variant<bool, vector<int>> find_journey(int n, int M, vector<int> U, vector<int> V) {
    E.assign(n, {});
    for (int i = 0; i < M; i++) {
        E[U[i]].push_back({V[i], i});
        E[V[i]].push_back({U[i], i});
    }

    vis.assign(n, false);
    dfs(0);

    return tr;
}

• Subtask 1: 0 / 5
• Subtask 2: 1.75 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45