Submission #570832

#	Time	Username	Problem	Language	Result	Execution time	Memory
570832		1ne	Commuter Pass (JOI18_commuter_pass)	C++14	15 / 100	2092 ms	262144 KiB

commuter_pass

#include<bits/stdc++.h>
using namespace std;
struct point{
	int64_t u,pp,bb;
};
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	int64_t n,m;cin>>n>>m;
	int64_t S,T;cin>>S>>T;
	--S;--T;
	int64_t U,V;cin>>U>>V;
	--U;--V;
	vector<vector<pair<int64_t,int64_t>>>adj(n);
	for (int64_t i = 0;i<m;++i){
		int64_t x,y,z;cin>>x>>y>>z;
		--x;--y;
		adj[x].push_back({y,z});
		adj[y].push_back({x,z});
	}
	const int64_t mxn = 1e18;
	priority_queue<pair<int64_t,pair<int64_t,int64_t>>>q;
	vector<vector<int64_t>>dist(n,vector<int64_t>(2,mxn));
	q.push({0,{U,0}});
	q.push({0,{V,1}});
	dist[U][0] = 0;
	dist[V][1] = 0;
	while(!q.empty()){
		auto u = q.top().second;
		q.pop();
		for (auto x:adj[u.first]){
			if (dist[x.first][u.second] > dist[u.first][u.second] + x.second){
				dist[x.first][u.second] = dist[u.first][u.second] + x.second;
				q.push({-dist[x.first][u.second],{x.first,u.second}});
			}
		}
	}
	int64_t ans = dist[U][1];
	vector<int64_t>dis(n,mxn);
	priority_queue<pair<long long,long long>>qs;
	qs.push({0,S});
	dis[S] = 0;
	while(!qs.empty()){
		auto u = qs.top();
		qs.pop();
		if (-u.first > dis[u.second])continue;
		for (auto x:adj[u.second]){
			if (dis[x.first] > dis[u.second] + x.second){
				dis[x.first] = dis[u.second] + x.second;
				qs.push({-dis[x.first],x.first});
			}
		}
	}
	auto bfs = [&](){
		queue<point>qq;
		qq.push({S,dist[S][0],dist[S][1]});
		while(!qq.empty()){
			auto u = qq.front();
			qq.pop();
			if (u.u == T){
				ans = min(ans,u.pp + u.bb);
				continue;
			}
			for (auto x:adj[u.u]){
				if (dis[x.first] == dis[u.u] + x.second){
					qq.push({x.first,min(u.pp,dist[x.first][0]),min(u.bb,dist[x.first][1])});
				}
			}
		}
	};
	bfs();
	cout<<ans<<'\n';
	return 0;
}

• Subtask 1: 0 / 16
• Subtask 2: 15 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45