Submission #869354

#	Time	Username	Problem	Language	Result	Execution time	Memory
869354		vjudge1	Commuter Pass (JOI18_commuter_pass)	C++17	0 / 100	421 ms	22040 KiB

commuter_pass

#include <bits/stdc++.h>
using namespace std;
#define fr first
#define sc second
#define ll long long int
const int mxn=1e5+5;
ll n,m,dis[2][mxn],s,t,u,v,par[2][mxn],ans=1e18;
vector<pair<int,int> >yal[mxn];
set<pair<ll,ll> >st;
void dij(int r,int f){
	for(int i=1;i<=n;i++){
		dis[f][i]=(i==r)?0:1e18;
		st.insert({dis[f][i],i});
	}
	while(st.size()){
		auto x=*st.begin();
		st.erase({x.fr,x.sc});
		//cout<<x.sc<<" "<<par[f][x.sc]<<endl;
		for(auto i:yal[x.sc]){
			if(dis[f][i.fr]>x.fr+i.sc){
				st.erase({dis[f][i.fr],i.fr});
				dis[f][i.fr]=x.fr+i.sc;
				st.insert({dis[f][i.fr],i.fr});
				par[f][i.fr]=x.sc;
			}
		}
	}
}
int main(){
	cin>>n>>m;
	cin>>s>>t>>u>>v;
	for(int i=1;i<=m;i++){
		int x,y,w;
		cin>>x>>y>>w;
		yal[x].push_back({y,w});
		yal[y].push_back({x,w});
	}
	dij(s,0);
	//cout<<endl;
	dij(v,1);
	for(int x=t;x!=0;x=par[0][x]){
		//cout<<x<<" ";
		ans=min(ans,dis[1][x]);
	}
	cout<<ans;
}

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