제출 #1042491

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1042491		Alihan_8	수천개의 섬 (IOI22_islands)	C++17	1.75 / 100	17 ms	4188 KiB

islands

#include "islands.h"

#include <variant>
#include <vector>

#include <bits/stdc++.h>

using namespace std;

#define pb push_back

template <class F, class S>
bool chmin(F &u, const S &v){
	bool flag = false;
	
	if ( u > v ){
		u = v; flag |= true;
	}
	
	return flag;
}

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]);
	}
	
	vector <int> d(n, n + 1);
	
	queue <int> q;
	
	q.push(0); d[0] = 0;
	
	bool has = false;
	
	while ( !q.empty() ){
		int u = q.front();
		q.pop();
		
		for ( auto &v: adj[u] ){
			if ( chmin(d[v], d[u] + 1) ){
				q.push(v);
			} else if ( d[v] == d[u] + 1 ){
				has = true;
			}
		}
	}
	
	set <int> st;
	
	for ( auto &x: d ) st.insert(x);
	
	return ((int)st.size() != n || has);
}

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