Submission #745535

#	Time	Username	Problem	Language	Result	Execution time	Memory
745535		Pacybwoah	Olympic Bus (JOI20_ho_t4)	C++14	11 / 100	75 ms	3800 KiB

ho_t4

#include<iostream>
#include<utility>
#include<vector>
#include<algorithm>
#define ll long long
using namespace std;
int main(){
    int n,m;
    cin>>n>>m;
    vector<vector<pair<ll,pair<ll,ll>>>> graph(n+1);
    int a,b,c,d;
    vector<vector<ll>> dist(n+1,vector<ll>(n+1,1e18));
    for(int i=1;i<=n;i++) dist[i][i]=0;
    for(int i=0;i<m;i++){
        cin>>a>>b>>c>>d;
        graph[a].push_back(make_pair(b,make_pair(c,d)));
        dist[a][b]=min(dist[a][b],1ll*c);
    }
    for(int k=1;k<=n;k++){
        for(int i=1;i<=n;i++){
            for(int j=1;j<=n;j++){
                dist[i][j]=min(dist[i][j],dist[i][k]+dist[k][j]);
            }
        }
    }
    ll ans=dist[1][n]+dist[n][1];
    for(int i=1;i<=n;i++){
        for(auto x:graph[i]){
            ans=min(ans,min(dist[1][n],dist[1][x.first]+x.second.first+dist[i][n])+min(dist[n][1],dist[n][x.first]+x.second.first+dist[i][1])+x.second.second);
        }

    }
    if(ans>=1e18) cout<<-1;
    else cout<<ans;
    //for(int i=1;i<=n;i++) for(int j=1;j<=n;j++) cout<<i<<" "<<j<<" "<<dist[i][j]<<"\n";
}

• Subtask 1: 0 / 5
• Subtask 2: 11 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 63