Submission #1042486

#	Time	Username	Problem	Language	Result	Execution time	Memory
1042486		Alihan_8	Thousands Islands (IOI22_islands)	C++17	9.10 / 100	19 ms	4180 KiB

islands

#include "islands.h"

#include <variant>
#include <vector>

#include <bits/stdc++.h>

using namespace std;

#define pb push_back

std::variant<bool, std::vector<int>> find_journey(
    int N, int M, std::vector<int> U, std::vector<int> V) {
  
	int n = N, m = M;
	
	// subtask #3
	
	vector <vector<int>> adj(n);
	
	for ( int i = 0; i < m; i++ ){
		adj[U[i]].pb(V[i]);
	}
	
	bool has = false;
	
	vector <int> us(n);
	
	auto dfs = [&](auto dfs, int u, int p) -> void{
		bool vis = false;
		
		us[u] = 1;
		
		int child = 0;
		
		for ( auto &v: adj[u] ){
			if ( v == p && !vis ){
				vis = true;
				
				continue;
			}
			
			if ( !us[v] ){
				dfs(dfs, v, u);
				
				child += 1;
			} else has = true;
		}
		
		if ( child > 1 ) has = 1;
	};
	
	dfs(dfs, 0, -1);
	
	return has;
}

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