Submission #945690

#	Time	Username	Problem	Language	Result	Execution time	Memory
945690		ezzzay	Commuter Pass (JOI18_commuter_pass)	C++14	0 / 100	2050 ms	262144 KiB

commuter_pass

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define pb push_back
const int N=3e5+5;
vector<pair<int,int>>v[N];
set<int>st[N];
int dist[N];
int tmp[N];
int par[N];
bool vis[N];
vector<pair<int,int>>vc;
signed main(){
    int n,m,s,t,x,y;
    cin>>n>>m>>s>>t>>x>>y;
    for(int i=0;i<m;i++){
        int a,b,c;
        cin>>a>>b>>c;
        v[a].pb({b,c});
        v[b].pb({a,c});
    }
    for(int i=1;i<=n;i++){
        dist[i]=1e16;
    }
    priority_queue<pair<int,int>>q;
    q.push({0,s});
    par[s]=s;
    dist[s]=0;
    vis[s]=1;
    while(!q.empty()){
        int w=-q.top().ff;
        int a=q.top().ss;
        q.pop();
        if(dist[a]<w)continue;
        for(auto p:v[a]){
            
            int b=p.ff;
            int c=p.ss;
            st[b].clear();
            st[b]=st[a];
            st[b].insert(b);
            if(dist[a]+c<=dist[b]){
               
                dist[b]=dist[a]+c;
                par[b]=a;
                q.push({-dist[b],b});
            }
        }
    }
    
    for(auto a:st[t]){
        vis[a]=1;
    }
    while(t!=s){
        v[t].pb({par[t],0});
        v[par[t]].pb({t,0});
        t=par[t];
    }
    for(int i=1;i<=n;i++){
        dist[i]=1e16;
    }
    s=y;
    q.push({0,s});
    par[s]=s;
    dist[s]=0;
    while(!q.empty()){
        int w=-q.top().ff;
        int a=q.top().ss;
        q.pop();
        if(dist[a]<w)continue;
        for(auto p:v[a]){
            int b=p.ff;
            int c=p.ss;
            if(dist[a]+c<dist[b]){
                dist[b]=dist[a]+c;
                par[b]=a;
                q.push({-dist[b],b});
            }
        }
    }
    int ans=INT_MAX;
    for(int i=1;i<=n;i++){
        if(vis[i]){
           
            ans=min(ans,dist[i]);
        }
    }
    cout<<ans;
}

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