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Submission #800369

# Submission time Handle Problem Language Result Execution time Memory
800369 2023-08-01T13:48:32 Z ttamx Commuter Pass (JOI18_commuter_pass) C++14
100 / 100
 220 ms 21988 KB 
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll,ll> p2;

const int N=1e5+5;
const ll inf=1e18;

int n,m,s,t,ss,tt;
vector<pair<int,int>> adj[N];
vector<ll> dist1(N,inf),dist2(N,inf),dist3(N,inf);
ll ans;
ll dp1[N],dp2[N];
bool vis[N];

void dijk(int st,vector<ll> &dist){
    priority_queue<p2,vector<p2>,greater<p2>> pq;
    vector<bool> vis(N);
    dist[st]=0;
    pq.emplace(0,st);
    while(!pq.empty()){
        auto [d,u]=pq.top();
        pq.pop();
        if(vis[u])continue;
        vis[u]=true;
        for(auto [v,w]:adj[u]){
            if(d+w>=dist[v])continue;
            dist[v]=d+w;
            pq.emplace(d+w,v);
        }
    }
}

void dfs(int u){
    if(vis[u])return;
    vis[u]=true;
    dp1[u]=dist1[u];
    dp2[u]=dist2[u];
    for(auto [v,w]:adj[u]){
        if(dist3[v]+w!=dist3[u])continue;
        dfs(v);
        dp1[u]=min(dp1[u],dp1[v]);
        dp2[u]=min(dp2[u],dp2[v]);
    }
    ans=min(ans,dp1[u]+dist2[u]);
    ans=min(ans,dp2[u]+dist1[u]);
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> m >> s >> t >> ss >> tt;
    for(int i=0;i<m;i++){
        int u,v,w;
        cin >> u >> v >> w;
        adj[u].emplace_back(v,w);
        adj[v].emplace_back(u,w);
    }
    dijk(ss,dist1);
    dijk(tt,dist2);
    dijk(s,dist3);
    ans=dist1[tt];
    dfs(t);
    cout << ans << "\n";
}

Compilation message

commuter_pass.cpp: In function 'void dijk(int, std::vector<long long int>&)':
commuter_pass.cpp:24:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   24 |         auto [d,u]=pq.top();
      |              ^
commuter_pass.cpp:28:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   28 |         for(auto [v,w]:adj[u]){
      |                  ^
commuter_pass.cpp: In function 'void dfs(int)':
commuter_pass.cpp:41:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   41 |     for(auto [v,w]:adj[u]){
      |              ^

Subtask #1
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 143 ms 18236 KB Output is correct
2 Correct 142 ms 16764 KB Output is correct
3 Correct 158 ms 21988 KB Output is correct
4 Correct 212 ms 18172 KB Output is correct
5 Correct 158 ms 16544 KB Output is correct
6 Correct 220 ms 18384 KB Output is correct
7 Correct 172 ms 16624 KB Output is correct
8 Correct 142 ms 16684 KB Output is correct
9 Correct 140 ms 17444 KB Output is correct
10 Correct 124 ms 17420 KB Output is correct
11 Correct 83 ms 15036 KB Output is correct
12 Correct 164 ms 17336 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 164 ms 18820 KB Output is correct
2 Correct 186 ms 18992 KB Output is correct
3 Correct 178 ms 18604 KB Output is correct
4 Correct 173 ms 18868 KB Output is correct
5 Correct 159 ms 19476 KB Output is correct
6 Correct 192 ms 21456 KB Output is correct
7 Correct 198 ms 21656 KB Output is correct
8 Correct 200 ms 19008 KB Output is correct
9 Correct 217 ms 19384 KB Output is correct
10 Correct 174 ms 18648 KB Output is correct
11 Correct 54 ms 16772 KB Output is correct
12 Correct 181 ms 21700 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 6100 KB Output is correct
2 Correct 3 ms 5052 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 16 ms 7128 KB Output is correct
5 Correct 10 ms 6100 KB Output is correct
6 Correct 3 ms 5076 KB Output is correct
7 Correct 3 ms 5204 KB Output is correct
8 Correct 4 ms 5204 KB Output is correct
9 Correct 4 ms 5076 KB Output is correct
10 Correct 10 ms 6060 KB Output is correct
11 Correct 3 ms 5048 KB Output is correct
12 Correct 2 ms 5076 KB Output is correct
13 Correct 3 ms 5076 KB Output is correct
14 Correct 3 ms 5056 KB Output is correct
15 Correct 2 ms 5076 KB Output is correct

Subtask #4
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 143 ms 18236 KB Output is correct
2 Correct 142 ms 16764 KB Output is correct
3 Correct 158 ms 21988 KB Output is correct
4 Correct 212 ms 18172 KB Output is correct
5 Correct 158 ms 16544 KB Output is correct
6 Correct 220 ms 18384 KB Output is correct
7 Correct 172 ms 16624 KB Output is correct
8 Correct 142 ms 16684 KB Output is correct
9 Correct 140 ms 17444 KB Output is correct
10 Correct 124 ms 17420 KB Output is correct
11 Correct 83 ms 15036 KB Output is correct
12 Correct 164 ms 17336 KB Output is correct
13 Correct 164 ms 18820 KB Output is correct
14 Correct 186 ms 18992 KB Output is correct
15 Correct 178 ms 18604 KB Output is correct
16 Correct 173 ms 18868 KB Output is correct
17 Correct 159 ms 19476 KB Output is correct
18 Correct 192 ms 21456 KB Output is correct
19 Correct 198 ms 21656 KB Output is correct
20 Correct 200 ms 19008 KB Output is correct
21 Correct 217 ms 19384 KB Output is correct
22 Correct 174 ms 18648 KB Output is correct
23 Correct 54 ms 16772 KB Output is correct
24 Correct 181 ms 21700 KB Output is correct
25 Correct 7 ms 6100 KB Output is correct
26 Correct 3 ms 5052 KB Output is correct
27 Correct 3 ms 5076 KB Output is correct
28 Correct 16 ms 7128 KB Output is correct
29 Correct 10 ms 6100 KB Output is correct
30 Correct 3 ms 5076 KB Output is correct
31 Correct 3 ms 5204 KB Output is correct
32 Correct 4 ms 5204 KB Output is correct
33 Correct 4 ms 5076 KB Output is correct
34 Correct 10 ms 6060 KB Output is correct
35 Correct 3 ms 5048 KB Output is correct
36 Correct 2 ms 5076 KB Output is correct
37 Correct 3 ms 5076 KB Output is correct
38 Correct 3 ms 5056 KB Output is correct
39 Correct 2 ms 5076 KB Output is correct
40 Correct 144 ms 18700 KB Output is correct
41 Correct 156 ms 17416 KB Output is correct
42 Correct 183 ms 17452 KB Output is correct
43 Correct 60 ms 15792 KB Output is correct
44 Correct 77 ms 15764 KB Output is correct
45 Correct 163 ms 16468 KB Output is correct
46 Correct 155 ms 16208 KB Output is correct
47 Correct 151 ms 18120 KB Output is correct
48 Correct 62 ms 12748 KB Output is correct
49 Correct 157 ms 18300 KB Output is correct
50 Correct 174 ms 16580 KB Output is correct
51 Correct 166 ms 16552 KB Output is correct