Submission #1167811

#	Time	Username	Problem	Language	Result	Execution time	Memory
1167811		kla	Commuter Pass (JOI18_commuter_pass)	C++20	0 / 100	1224 ms	327680 KiB

commuter_pass

#include <bits/stdc++.h>

using namespace std;
vector<pair<int, int>>M[100001];
long long U[100001]={};
long long V[100001]={};
long long bals[100001]={};
long long kopy[100001]={};
priority_queue<tuple<long long, int, long long, long long>, vector<tuple<long long, int, long long, long long>>, greater<tuple<long long, int, long long, long long>>>pq={};
long long nxt(){
    long long n;
    cin>>n;
    return n;
}
void DjikstrasimU(int sak){
    U[sak]=0, pq.push(make_tuple(0, sak, 0, 0));
    while(pq.size()!=0){
        int v=get<1>(pq.top());
        long long att=get<0>(pq.top());
        pq.pop();
        for(auto c: M[v]){
            if(att+c.second<U[c.first]){
                    U[c.first]=att+c.second, pq.push(make_tuple(U[c.first], c.first, 0, 0));
            }
        }
    }
}
void DjikstrasimV(int sak){
    V[sak]=0, pq.push(make_tuple(0, sak, 0, 0));
    while(pq.size()!=0){
        int v=get<1>(pq.top());
        long long att=get<0>(pq.top());
        pq.pop();
        for(auto c: M[v]){
            if(att+c.second<V[c.first]){
                    V[c.first]=att+c.second, pq.push(make_tuple(V[c.first], c.first, 0, 0));
            }
        }
    }
}
long long Djikstra(int sak, int ender, long long iss){
    bals[sak]=0;
    pq.push(make_tuple(0, sak, V[sak], U[sak]));
    while(get<1>(pq.top())!=ender){
        //cout<<get<1>(pq.top())<<' '<<get<4>(pq.top())<<' '<<get<2>(pq.top())<<' '<<get<3>(pq.top())<<'\n';
        int v=get<1>(pq.top());
        long long att=get<0>(pq.top()), vak=get<2>(pq.top()), uak=get<3>(pq.top());
        pq.pop();
        for(auto c: M[v]){
            if(c.second+att<=bals[c.first]&&kopy[c.first]>=min(vak, V[c.first])+min(uak, U[c.first]))bals[c.first]=c.second+att, kopy[c.first]=min(vak, V[c.first])+min(uak, U[c.first]), pq.push(make_tuple(bals[c.first], c.first, min(vak, V[c.first]), min(uak, U[c.first])));        }
    }
    return min(iss, kopy[ender]);
}
int main()
{
    long long  n, m, s, t, u, v, sk1, sk2, sv;
    cin>>n>>m>>s>>t>>u>>v;
    for(int i=0; i<m; i++){
        sk1=nxt(), sk2=nxt(), sv=nxt();
        M[sk1].push_back({sk2, sv});
        M[sk2].push_back({sk1, sv});
    }
    fill(U, U+n+1, LONG_LONG_MAX);
    fill(V, V+n+1, LONG_LONG_MAX);
    fill(bals, bals+n+1, LONG_LONG_MAX);
    fill(kopy, kopy+n+1, LONG_LONG_MAX);
    DjikstrasimU(u);
    DjikstrasimV(v);
    cout<<Djikstra(s, t, U[v])<<endl;
    return 0;
}

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