oj.uz

Submission #927786

# Submission time Handle Problem Language Result Execution time Memory
927786 2024-02-15T10:41:25 Z Unforgettablepl Olympic Bus (JOI20_ho_t4) C++17
5 / 100
 54 ms 4180 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long

const int INF = 1e15;

struct edge{
    int u,v,c,d;
};

edge edges[50001];
set<pair<int,int>> adj[201];
bool visited[50001];
int dist[201][201];
int n;

int dijkastra(){
    priority_queue<pair<int,int>> q;
    for(bool&i:visited)i=false;
    int ans1 = INF;
    q.emplace(0,1);
    while(!q.empty()){
        auto curr = q.top();q.pop();curr.first=-curr.first;
        if(visited[curr.second])continue;
        visited[curr.second]=true;
        if(curr.second==n){ans1=curr.first;break;}
        for(auto&i:adj[curr.second]){
            if(!visited[i.first])q.emplace(-curr.first-i.second,i.first);
        }
    }
    while(!q.empty())q.pop();
    for(bool&i:visited)i=false;
    int ans2 = INF;
    q.emplace(0,n);
    while(!q.empty()){
        auto curr = q.top();q.pop();curr.first=-curr.first;
        if(visited[curr.second])continue;
        visited[curr.second]=true;
        if(curr.second==1){ans2=curr.first;break;}
        for(auto&i:adj[curr.second]){
            if(!visited[i.first])q.emplace(-curr.first-i.second,i.first);
        }
    }
    return ans1+ans2;
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int m;
    cin >> n >> m;
    for(auto&i:dist)for(int&j:i)j=INF;
    for(int i=1;i<=m;i++){
        int u,v,c,d;
        cin >> u >> v >> c >> d;
        edges[i] = {u,v,c,d};
        adj[u].emplace(v,c);
        dist[u][v]=min(dist[u][v],c);
    }
    for(int i=1;i<=n;i++)dist[i][i]=0;
    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]);
            }
        }
    }
    int baseans = dist[1][n]+dist[n][1];
    for(int i=1;i<=m;i++){
        int to = min(dist[1][n],dist[1][edges[i].v]+dist[edges[i].u][n]+edges[i].c);
        int back = min(dist[n][1],dist[n][edges[i].v]+dist[edges[i].u][1]+edges[i].c);
        if(to+back+edges[i].d<baseans){
            adj[edges[i].u].erase({edges[i].v,edges[i].c});
            adj[edges[i].v].emplace(edges[i].u,edges[i].c);
            baseans = min(baseans,edges[i].d+dijkastra());
            adj[edges[i].v].erase({edges[i].u,edges[i].c});
            adj[edges[i].u].emplace(edges[i].v,edges[i].c);
        }
    }
    cout << (baseans>=INF ? -1 : baseans) << '\n';
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 860 KB Output is correct
2 Correct 7 ms 856 KB Output is correct
3 Correct 7 ms 856 KB Output is correct
4 Correct 7 ms 860 KB Output is correct
5 Correct 1 ms 856 KB Output is correct
6 Correct 7 ms 812 KB Output is correct
7 Correct 0 ms 604 KB Output is correct
8 Correct 1 ms 600 KB Output is correct
9 Correct 2 ms 860 KB Output is correct
10 Correct 13 ms 884 KB Output is correct
11 Correct 22 ms 944 KB Output is correct
12 Correct 12 ms 888 KB Output is correct
13 Correct 8 ms 860 KB Output is correct
14 Correct 11 ms 892 KB Output is correct
15 Correct 11 ms 860 KB Output is correct
16 Correct 8 ms 924 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 3676 KB Output is correct
2 Correct 27 ms 4180 KB Output is correct
3 Correct 34 ms 3676 KB Output is correct
4 Incorrect 8 ms 856 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 892 KB Output is correct
2 Correct 9 ms 604 KB Output is correct
3 Correct 26 ms 3420 KB Output is correct
4 Correct 7 ms 860 KB Output is correct
5 Correct 27 ms 4136 KB Output is correct
6 Correct 0 ms 600 KB Output is correct
7 Correct 0 ms 604 KB Output is correct
8 Correct 47 ms 4056 KB Output is correct
9 Correct 54 ms 4124 KB Output is correct
10 Correct 26 ms 3420 KB Output is correct
11 Correct 26 ms 3420 KB Output is correct
12 Correct 37 ms 3476 KB Output is correct
13 Incorrect 1 ms 604 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 860 KB Output is correct
2 Correct 7 ms 856 KB Output is correct
3 Correct 7 ms 856 KB Output is correct
4 Correct 7 ms 860 KB Output is correct
5 Correct 1 ms 856 KB Output is correct
6 Correct 7 ms 812 KB Output is correct
7 Correct 0 ms 604 KB Output is correct
8 Correct 1 ms 600 KB Output is correct
9 Correct 2 ms 860 KB Output is correct
10 Correct 13 ms 884 KB Output is correct
11 Correct 22 ms 944 KB Output is correct
12 Correct 12 ms 888 KB Output is correct
13 Correct 8 ms 860 KB Output is correct
14 Correct 11 ms 892 KB Output is correct
15 Correct 11 ms 860 KB Output is correct
16 Correct 8 ms 924 KB Output is correct
17 Correct 25 ms 3676 KB Output is correct
18 Correct 27 ms 4180 KB Output is correct
19 Correct 34 ms 3676 KB Output is correct
20 Incorrect 8 ms 856 KB Output isn't correct
21 Halted 0 ms 0 KB -