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Submission #1063101

# Submission time Handle Problem Language Result Execution time Memory
1063101 2024-08-17T14:16:08 Z _8_8_ Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 648 ms 9852 KB 
#include <bits/stdc++.h>

using namespace std;
    
typedef long long ll;
const int  N = 1e5 + 12, MOD = (int)1e9 + 7;
#define int ll
const ll inf = 1e16;
int n,m;
int U[N],V[N],C[N],D[N];
void dijkstra(int ver,vector<ll> &d,vector<int> &pr) {
    d.resize(n);
    pr.resize(n);
    for(int i = 0;i < n;i++) {
        d[i] = inf;
    }
    d[ver] = 0;
    vector<int> vis(n,0);
    vector<vector<int>> g;g.resize(n);
    for(int i = 0;i < m;++i) {
        g[U[i]].push_back(i);
    }
    for(int i = 0;i < n;i++) {
        int v = -1;
        for(int j = 0;j < n;j++) {
            if(vis[j]) continue;
            if(v == -1 || d[j] < d[v]) {
                v = j;
            }
        }
        vis[v] = 1;
        for(int t:g[v]) {
            int to = V[t],w = C[t];
            if(d[to] > d[v] + w) {
                d[to] = d[v] + w;
                pr[to] = t;
            }
        }
    }
}
vector<ll> d[N];
vector<int> p[N];
ll res = inf;
bool in[N];
void test() {
    cin >> n >> m;
    for(int i = 0;i < m;i++) {
        cin >> U[i] >> V[i] >> C[i] >> D[i];
        U[i]--;V[i]--;
    }
    for(int i = 0;i < n;++i) {
        dijkstra(i,d[i],p[i]);
    }
    res = d[0][n-1] + d[n - 1][0];
    vector<ll> bfd;
    vector<int> bfp;
    // for(int j = 0;j < m;j++) {
    //     in[j] = 1;
    //     swap(V[j],U[j]);
    //     ll nv = D[j];
    //     dijkstra(0,bfd,bfp);
    //     nv += bfd[n - 1];
    //     dijkstra(n - 1,bfd,bfp);
    //     nv += bfd[0];
    //     res = min(res,nv);
    //     swap(V[j],U[j]);
    // }
    auto make = [&](int j){
        in[j] = 1;
        swap(V[j],U[j]);
        ll nv = D[j];
        dijkstra(0,bfd,bfp);
        nv += bfd[n - 1];
        dijkstra(n - 1,bfd,bfp);
        nv += bfd[0];
        res = min(res,nv);
        swap(V[j],U[j]);
    };
    for(int i = 0;i < n;i++) {
        if(d[0][i] != inf && i != 0) {
            // cout << i << ' ' << p[0][i] << "x\n";
            make(p[0][i]);
        }   
        if(d[n - 1][i] != inf && i != n - 1) {
            make(p[n - 1][i]);
        }
    }
    for(int i = 0;i < m;i++) {
        if(in[i]) continue;
        swap(U[i],V[i]);
        ll val = min(d[0][n - 1],d[0][U[i]] + d[V[i]][n - 1] + C[i]) + D[i];
        val += min(d[n - 1][0],d[n - 1][U[i]] + d[V[i]][0] + C[i]);
        // cout << i << ' ' << val << ' ' << min(d[0][n-1],d[0][U[i]] + d[V[i]][n - 1] + C[i]) << ' ' << d[n - 1][U[i]] + d[V[i]][0] + C[i]  << '\n';
        res = min(res,val);
    }
    if(res >= inf) res = -1;
    cout << res << '\n';
}
signed main() {
    ios_base::sync_with_stdio(false);cin.tie(0);
    int t = 1; 
    // cin >> t;
    while(t--) {
        test();
    }
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 96 ms 5724 KB Output is correct
2 Correct 18 ms 5724 KB Output is correct
3 Correct 91 ms 5904 KB Output is correct
4 Correct 92 ms 5720 KB Output is correct
5 Correct 4 ms 5212 KB Output is correct
6 Correct 19 ms 5664 KB Output is correct
7 Correct 2 ms 4956 KB Output is correct
8 Correct 2 ms 4956 KB Output is correct
9 Correct 2 ms 5212 KB Output is correct
10 Correct 95 ms 5868 KB Output is correct
11 Correct 96 ms 5724 KB Output is correct
12 Correct 92 ms 5724 KB Output is correct
13 Correct 57 ms 5720 KB Output is correct
14 Correct 72 ms 5724 KB Output is correct
15 Correct 72 ms 5692 KB Output is correct
16 Correct 76 ms 5972 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 578 ms 9228 KB Output is correct
2 Correct 588 ms 9448 KB Output is correct
3 Correct 601 ms 9684 KB Output is correct
4 Correct 104 ms 5724 KB Output is correct
5 Correct 77 ms 5872 KB Output is correct
6 Correct 18 ms 5724 KB Output is correct
7 Correct 22 ms 5724 KB Output is correct
8 Correct 3 ms 4952 KB Output is correct
9 Correct 355 ms 9360 KB Output is correct
10 Correct 340 ms 9620 KB Output is correct
11 Correct 476 ms 9384 KB Output is correct
12 Correct 476 ms 9512 KB Output is correct
13 Correct 460 ms 9384 KB Output is correct
14 Correct 470 ms 9580 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 5640 KB Output is correct
2 Correct 29 ms 5724 KB Output is correct
3 Correct 462 ms 8372 KB Output is correct
4 Correct 24 ms 5724 KB Output is correct
5 Correct 578 ms 9112 KB Output is correct
6 Correct 3 ms 4952 KB Output is correct
7 Correct 2 ms 5168 KB Output is correct
8 Correct 324 ms 9108 KB Output is correct
9 Correct 384 ms 9116 KB Output is correct
10 Correct 481 ms 9168 KB Output is correct
11 Correct 463 ms 9120 KB Output is correct
12 Correct 524 ms 9212 KB Output is correct
13 Correct 2 ms 4956 KB Output is correct
14 Correct 2 ms 4956 KB Output is correct
15 Correct 2 ms 4956 KB Output is correct
16 Correct 2 ms 4956 KB Output is correct
17 Correct 2 ms 5164 KB Output is correct
18 Correct 2 ms 5172 KB Output is correct
19 Correct 550 ms 9164 KB Output is correct
20 Correct 495 ms 9136 KB Output is correct
21 Correct 470 ms 9172 KB Output is correct
22 Correct 520 ms 9120 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 96 ms 5724 KB Output is correct
2 Correct 18 ms 5724 KB Output is correct
3 Correct 91 ms 5904 KB Output is correct
4 Correct 92 ms 5720 KB Output is correct
5 Correct 4 ms 5212 KB Output is correct
6 Correct 19 ms 5664 KB Output is correct
7 Correct 2 ms 4956 KB Output is correct
8 Correct 2 ms 4956 KB Output is correct
9 Correct 2 ms 5212 KB Output is correct
10 Correct 95 ms 5868 KB Output is correct
11 Correct 96 ms 5724 KB Output is correct
12 Correct 92 ms 5724 KB Output is correct
13 Correct 57 ms 5720 KB Output is correct
14 Correct 72 ms 5724 KB Output is correct
15 Correct 72 ms 5692 KB Output is correct
16 Correct 76 ms 5972 KB Output is correct
17 Correct 578 ms 9228 KB Output is correct
18 Correct 588 ms 9448 KB Output is correct
19 Correct 601 ms 9684 KB Output is correct
20 Correct 104 ms 5724 KB Output is correct
21 Correct 77 ms 5872 KB Output is correct
22 Correct 18 ms 5724 KB Output is correct
23 Correct 22 ms 5724 KB Output is correct
24 Correct 3 ms 4952 KB Output is correct
25 Correct 355 ms 9360 KB Output is correct
26 Correct 340 ms 9620 KB Output is correct
27 Correct 476 ms 9384 KB Output is correct
28 Correct 476 ms 9512 KB Output is correct
29 Correct 460 ms 9384 KB Output is correct
30 Correct 470 ms 9580 KB Output is correct
31 Correct 100 ms 5640 KB Output is correct
32 Correct 29 ms 5724 KB Output is correct
33 Correct 462 ms 8372 KB Output is correct
34 Correct 24 ms 5724 KB Output is correct
35 Correct 578 ms 9112 KB Output is correct
36 Correct 3 ms 4952 KB Output is correct
37 Correct 2 ms 5168 KB Output is correct
38 Correct 324 ms 9108 KB Output is correct
39 Correct 384 ms 9116 KB Output is correct
40 Correct 481 ms 9168 KB Output is correct
41 Correct 463 ms 9120 KB Output is correct
42 Correct 524 ms 9212 KB Output is correct
43 Correct 2 ms 4956 KB Output is correct
44 Correct 2 ms 4956 KB Output is correct
45 Correct 2 ms 4956 KB Output is correct
46 Correct 2 ms 4956 KB Output is correct
47 Correct 2 ms 5164 KB Output is correct
48 Correct 2 ms 5172 KB Output is correct
49 Correct 550 ms 9164 KB Output is correct
50 Correct 495 ms 9136 KB Output is correct
51 Correct 470 ms 9172 KB Output is correct
52 Correct 520 ms 9120 KB Output is correct
53 Correct 572 ms 9292 KB Output is correct
54 Correct 564 ms 9168 KB Output is correct
55 Correct 648 ms 9188 KB Output is correct
56 Correct 94 ms 5724 KB Output is correct
57 Correct 92 ms 5724 KB Output is correct
58 Correct 480 ms 8504 KB Output is correct
59 Correct 518 ms 8528 KB Output is correct
60 Correct 465 ms 8504 KB Output is correct
61 Correct 462 ms 8512 KB Output is correct
62 Correct 499 ms 8520 KB Output is correct
63 Correct 462 ms 8520 KB Output is correct
64 Correct 596 ms 8920 KB Output is correct
65 Correct 553 ms 8524 KB Output is correct
66 Correct 584 ms 8544 KB Output is correct
67 Correct 20 ms 7984 KB Output is correct
68 Correct 355 ms 9348 KB Output is correct
69 Correct 375 ms 9852 KB Output is correct
70 Correct 505 ms 9380 KB Output is correct
71 Correct 444 ms 9364 KB Output is correct
72 Correct 487 ms 9568 KB Output is correct
73 Correct 485 ms 9736 KB Output is correct
74 Correct 473 ms 9660 KB Output is correct