Submission #666982

#	Time	Username	Problem	Language	Result	Execution time	Memory
666982		Darren0724	Robot (JOI21_ho_t4)	C++17	0 / 100	401 ms	48348 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define mp make_pair
const int INF=1e18;
struct edge{
    int to,c,p;
    edge(){}
    edge(int a,int b,int c1){
        to=a,c=b,p=c1;
    }
};

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n,m;cin>>n>>m;
    vector<vector<edge>> adj1(n);
    vector<vector<pair<int,int>>> adj(n);
    vector<map<int,int>> cnt(n);
    for(int i=0;i<m;i++){
        int a,b,c,d;cin>>a>>b>>c>>d;
        a--;b--;
        adj1[a].push_back(edge(b,c,d));
        adj1[b].push_back(edge(a,c,d));
        cnt[a][c]+=d;
        cnt[b][c]+=d;
    }
    for(int i=0;i<n;i++){
        for(edge &e:adj1[i]){
            adj[i].push_back({e.to,min(e.p,cnt[i][e.c]-e.p)});
        }
    }
    priority_queue<pii,vector<pii>,greater<pii>> pq;
    vector<bool> vis(n);
    vector<int> dis(n,INF);
    pq.push({0,0});
    while(pq.size()){
        int a,b;
        tie(a,b)=pq.top();
        pq.pop();
        if(vis[b]){
            continue;
        }
        vis[b]=1;
        for(pair<int,int> p:adj[b]){
            if(dis[p.first]>a+p.second){
                dis[p.first]=a+p.second;
                pq.push({dis[p.first],p.first});
            }
        }
    }
    if(dis[n-1]==INF){
        cout<<-1<<endl;
    }
    else{
        cout<<dis[n-1]<<endl;
    }


    return 0;
}

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42