Submission #582767

#	Time	Username	Problem	Language	Result	Execution time	Memory
582767		1ne	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	551 ms	90132 KiB

crocodile

#include "crocodile.h"
#include <bits/stdc++.h>
using namespace std;
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
	vector<vector<pair<long long,long long>>>adj(N);
	for (long long i = 0;i<M;++i){
		adj[R[i][0]].push_back({R[i][1],L[i]});
		adj[R[i][1]].push_back({R[i][0],L[i]});
	}
	const long long maxn = 1e9;
	vector<vector<long long>>dist(N,vector<long long>(2,maxn));
	priority_queue<pair<long long,long long>>q;
	for (long long i = 0;i<K;++i){
		q.push({0,P[i]});
		dist[P[i]][0] = 0;
		dist[P[i]][1] = 0;
	}
	while(!q.empty()){
		auto u = q.top();
		q.pop();
		if (dist[u.second][1] < -u.first)continue;
		for (auto x:adj[u.second]){
			if (dist[x.first][0] > -u.first + x.second){
				if (dist[x.first][1] > dist[x.first][0]){
					dist[x.first][1] = dist[x.first][0];
					q.push({-dist[x.first][1],x.first});
				}
				dist[x.first][0] = -u.first + x.second;
			}
			else if (dist[x.first][1] > -u.first + x.second){
				dist[x.first][1] = -u.first + x.second;
				q.push({-dist[x.first][1],x.first});
			}
		}
	}
	return dist[0][1];
}

• Subtask 1: 46 / 46
• Subtask 2: 43 / 43
• Subtask 3: 11 / 11