Submission #1167602

#	Time	Username	Problem	Language	Result	Execution time	Memory
1167602		mareksb	Commuter Pass (JOI18_commuter_pass)	C++20	31 / 100	204 ms	19512 KiB

commuter_pass

#include <bits/stdc++.h>
#pragma GCC optimize ("O3,unroll-loops")
#pragma GCC target ("avx2,bmi,bmi2,popcnt,lzcnt")
using namespace std;
const int64_t N=100005;
vector<pair<int64_t,int64_t>> mas[N];
int64_t dS[N];
int64_t dT[N];
int64_t dV[N];
int64_t dU[N];
int64_t n,m;
int64_t s,t;//commuter pass
int64_t u,v;
void dijkstra(int64_t start, int64_t* dist){
    priority_queue<pair<int64_t,int64_t>,vector<pair<int64_t,int64_t>>,greater<pair<int64_t,int64_t>>> pq;
    dist[start]=0;
    pq.push({0,start});
    while(!pq.empty()){
        int64_t x=pq.top().second;
        pq.pop();

        for(auto p:mas[x]){
            if(dist[x]+p.second<dist[p.first]){
                dist[p.first]=dist[x]+p.second;
                pq.push({dist[p.first],p.first});
            }
        }
    }
}
void dijkstra2(int64_t start, int64_t* dist){
    priority_queue<pair<int64_t,int64_t>,vector<pair<int64_t,int64_t>>,greater<pair<int64_t,int64_t>>> pq;
    dist[start]=0;
    pq.push({0,start});
    while(!pq.empty()){
        int64_t x=pq.top().second;
        pq.pop();

        for(auto p:mas[x]){
            int64_t cost=p.second;
            if(dS[x]+dT[x]==dS[t]&&dS[p.first]+dT[p.first]==dS[t]){
                cost=0;
            }
            if(dist[x]+cost<dist[p.first]){
                dist[p.first]=dist[x]+cost;
                pq.push({dist[p.first],p.first});
            }
        }
    }
}
void solve(){
    cin>>n>>m;
    for(int64_t i=0;i<=n;i++){
        dS[i]=LLONG_MAX/4;
        dT[i]=LLONG_MAX/4;
        dV[i]=LLONG_MAX/4;
        dU[i]=LLONG_MAX/4;
    }
    cin>>s>>t;
    cin>>u>>v;

    for(int64_t i=0;i<m;i++){
        int64_t x,y,c;
        cin>>x>>y>>c;
        mas[x].push_back({y,c});
        mas[y].push_back({x,c});
    }
    dijkstra(s,dS);
    dijkstra(t,dT);
    dijkstra2(v,dV);
    dijkstra2(u,dU);
    cout<<dV[u]<<'\n';
}

int main()
{
ios_base::sync_with_stdio(false);cin.tie(NULL);
    int64_t t=1;
    //cin>>t;
    while(t--){
        solve();
    }
    return 0;
}

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