Submission #1058388

#	Time	Username	Problem	Language	Result	Execution time	Memory
1058388		tolbi	Thousands Islands (IOI22_islands)	C++17	5 / 100	19 ms	4764 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>
using namespace std;
std::variant<bool, std::vector<int>> find_journey(
	int N, int M, std::vector<int> U, std::vector<int> V) {
	vector<vector<pair<int,int>>> arr(N);
	for (int i = 0; i < M; i++){
		arr[U[i]].push_back({V[i],i});
	}
	for (int i = 0; i < N; ++i)
	{
		sort(arr[i].begin(), arr[i].end());
	}
	if (arr[0].size()<=1) return false;
	int a = arr[0][0].first;
	int b = arr[0][1].first;
	if (a==b){
		return vector<int>{arr[0][0].second,arr[a][0].second,arr[0][1].second,arr[0][0].second,arr[a][0].second,arr[0][1].second};
	}
	else {
		return vector<int>{arr[0][0].second,arr[a][0].second,arr[0][1].second,arr[b][0].second,arr[a][0].second,arr[0][0].second,arr[b][0].second,arr[0][1].second};
	}
}

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