Submission #1183758

#	Time	Username	Problem	Language	Result	Execution time	Memory
1183758		gyg	Thousands Islands (IOI22_islands)	C++20	9.10 / 100	21 ms	7748 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>
using namespace std;
#define arr array
#define vec vector 
#define var variant
#define pii pair<int, int>
#define fir first 
#define sec second
const int N = 1e5 + 5;

int n, m;
arr<vec<pii>, N> adj;

arr<bool, N> vs;
bool dfs(int u = 1) {
    vs[u] = true;
    if (adj[u].size() >= 3) return true;
    for (auto [v, i] : adj[u])
        if (!vs[v] && dfs(v)) return true;
    return false;
}

var<bool, vec<int>> find_journey(int _n, int _m, vec<int> _u, vec<int> _v) {
    n = _n, m = _m;
    for (int i = 0; i < m; i++) {
        int u = _u[i] + 1, v = _v[i] + 1;
        adj[u].push_back({v, i});
    }

    if (adj[1].size() >= 2) return true;
    return dfs();
}

• Subtask 1: 0 / 5
• Subtask 2: 1.75 / 5
• Subtask 3: 7.35 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45