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Submission #499307

# Submission time Handle Problem Language Result Execution time Memory
499307 2021-12-27T23:42:08 Z Marceantasy Commuter Pass (JOI18_commuter_pass) C++17
100 / 100
 366 ms 23320 KB 
#include <bits/stdc++.h>
using namespace std; 

#define ll long long
#define ar array

const int mxN = 1e5+1, M = 1e9+7; 
int n, m, f[4], ord[mxN]; 
vector<ar<ll, 2>> adj[mxN];
ll dis[4][mxN], dp[mxN];

void dijkstra(ll* dist, int x){
    priority_queue<ar<ll, 2>, vector<ar<ll, 2>>, greater<ar<ll, 2>>> pq;
    pq.push({0, x});
    dist[x] = 0;
    while(pq.size()){
        ar<ll, 2> u = pq.top();
        pq.pop();

        //quiza esto está mal
        if(u[0] > dist[u[1]]) continue;
        for(ar<ll, 2> v : adj[u[1]]){
            if(dist[v[1]] > u[0]+v[0]){
                dist[v[1]] = u[0]+v[0];
                pq.push({dist[v[1]], v[1]});
            }
        }
    }
}

ll solve(int a, int b){
    iota(ord, ord+n, 0);
    memset(dp, 0, sizeof(dp));
    sort(ord, ord+n, [&](const int &p, const int &q){
        return dis[a][p] < dis[a][q];
    });
    ll ans = 1e18;
    for(int i = n-1; i>=0; --i){
        int x = ord[i];
        dp[x] = dis[3][x];
        for(ar<ll, 2> u : adj[x]){
            if(dis[a][x] + u[0] + dis[b][u[1]] == dis[a][f[b]]){
                dp[x] = min(dp[x], dp[u[1]]);
            }
        }
        ans = min(ans, dp[x] + dis[2][x]);
    }
    return ans;
}

int main(){
#ifdef _DEBUG
//	freopen("input.txt", "r", stdin);
//	freopen("output.txt", "w", stdout);
#endif
    std::ios_base::sync_with_stdio(false); std::cin.tie(0); std::cout.tie(0);

    cin >> n >> m;
    for(int i = 0; i<4; ++i){
        cin >> f[i];
        f[i]--;
    }
    for(int i = 0; i<m; ++i){
        int a, b, c; 
        cin >> a >> b >> c, --a, --b; 
        adj[a].push_back({c, b}); 
        adj[b].push_back({c, a});
    } 
    memset(dis, 0x3f, sizeof(dis));
    for(int i = 0; i<4; ++i){
        dijkstra(dis[i], f[i]);
    }
    ll ans = min(min(solve(0, 1), solve(1, 0)), dis[2][f[3]]);
    cout << ans << "\n"; 
}

Subtask #1
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 333 ms 23224 KB Output is correct
2 Correct 305 ms 21632 KB Output is correct
3 Correct 366 ms 23048 KB Output is correct
4 Correct 335 ms 22996 KB Output is correct
5 Correct 297 ms 21336 KB Output is correct
6 Correct 327 ms 23320 KB Output is correct
7 Correct 312 ms 21476 KB Output is correct
8 Correct 326 ms 21600 KB Output is correct
9 Correct 298 ms 22324 KB Output is correct
10 Correct 310 ms 22436 KB Output is correct
11 Correct 130 ms 14220 KB Output is correct
12 Correct 341 ms 22212 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 306 ms 21808 KB Output is correct
2 Correct 359 ms 21680 KB Output is correct
3 Correct 309 ms 21560 KB Output is correct
4 Correct 362 ms 21552 KB Output is correct
5 Correct 318 ms 21544 KB Output is correct
6 Correct 296 ms 21876 KB Output is correct
7 Correct 303 ms 21468 KB Output is correct
8 Correct 316 ms 21616 KB Output is correct
9 Correct 321 ms 21616 KB Output is correct
10 Correct 312 ms 21608 KB Output is correct
11 Correct 130 ms 14284 KB Output is correct
12 Correct 294 ms 21900 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8260 KB Output is correct
2 Correct 3 ms 6604 KB Output is correct
3 Correct 4 ms 6524 KB Output is correct
4 Correct 16 ms 9976 KB Output is correct
5 Correct 10 ms 8200 KB Output is correct
6 Correct 4 ms 6604 KB Output is correct
7 Correct 4 ms 6732 KB Output is correct
8 Correct 4 ms 6860 KB Output is correct
9 Correct 4 ms 6640 KB Output is correct
10 Correct 10 ms 8244 KB Output is correct
11 Correct 3 ms 6604 KB Output is correct
12 Correct 3 ms 6604 KB Output is correct
13 Correct 3 ms 6604 KB Output is correct
14 Correct 4 ms 6732 KB Output is correct
15 Correct 4 ms 6564 KB Output is correct

Subtask #4
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 333 ms 23224 KB Output is correct
2 Correct 305 ms 21632 KB Output is correct
3 Correct 366 ms 23048 KB Output is correct
4 Correct 335 ms 22996 KB Output is correct
5 Correct 297 ms 21336 KB Output is correct
6 Correct 327 ms 23320 KB Output is correct
7 Correct 312 ms 21476 KB Output is correct
8 Correct 326 ms 21600 KB Output is correct
9 Correct 298 ms 22324 KB Output is correct
10 Correct 310 ms 22436 KB Output is correct
11 Correct 130 ms 14220 KB Output is correct
12 Correct 341 ms 22212 KB Output is correct
13 Correct 306 ms 21808 KB Output is correct
14 Correct 359 ms 21680 KB Output is correct
15 Correct 309 ms 21560 KB Output is correct
16 Correct 362 ms 21552 KB Output is correct
17 Correct 318 ms 21544 KB Output is correct
18 Correct 296 ms 21876 KB Output is correct
19 Correct 303 ms 21468 KB Output is correct
20 Correct 316 ms 21616 KB Output is correct
21 Correct 321 ms 21616 KB Output is correct
22 Correct 312 ms 21608 KB Output is correct
23 Correct 130 ms 14284 KB Output is correct
24 Correct 294 ms 21900 KB Output is correct
25 Correct 10 ms 8260 KB Output is correct
26 Correct 3 ms 6604 KB Output is correct
27 Correct 4 ms 6524 KB Output is correct
28 Correct 16 ms 9976 KB Output is correct
29 Correct 10 ms 8200 KB Output is correct
30 Correct 4 ms 6604 KB Output is correct
31 Correct 4 ms 6732 KB Output is correct
32 Correct 4 ms 6860 KB Output is correct
33 Correct 4 ms 6640 KB Output is correct
34 Correct 10 ms 8244 KB Output is correct
35 Correct 3 ms 6604 KB Output is correct
36 Correct 3 ms 6604 KB Output is correct
37 Correct 3 ms 6604 KB Output is correct
38 Correct 4 ms 6732 KB Output is correct
39 Correct 4 ms 6564 KB Output is correct
40 Correct 278 ms 23076 KB Output is correct
41 Correct 315 ms 22264 KB Output is correct
42 Correct 305 ms 22340 KB Output is correct
43 Correct 127 ms 14380 KB Output is correct
44 Correct 125 ms 14276 KB Output is correct
45 Correct 260 ms 21644 KB Output is correct
46 Correct 271 ms 20928 KB Output is correct
47 Correct 289 ms 23032 KB Output is correct
48 Correct 136 ms 13696 KB Output is correct
49 Correct 245 ms 22720 KB Output is correct
50 Correct 284 ms 21488 KB Output is correct
51 Correct 255 ms 21128 KB Output is correct