oj.uz

답안 #527026

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
527026 2022-02-16T19:57:22 Z AdamGS Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 799 ms 3816 KB 
#include<bits/stdc++.h>
using namespace std;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
const int MAXN=207, MAXM=5e4+7, INF=2e9+7;
vector<int>V[MAXN];
pair<pair<int,int>,pair<int,int>>T[MAXM];
int odl[MAXN][4], odw[MAXM], mi[MAXN], n, m;
void dijkstra1(int v, int r, int p) {
    rep(i, n) odl[i][p]=INF;
    priority_queue<pair<int,pair<int,int>>>q;
    q.push({0, {v, -1}});
    while(!q.empty()) {
        int o=-q.top().st, a=q.top().nd.st, b=q.top().nd.nd; q.pop();
        if(odl[a][p]<=o) continue;
        odl[a][p]=o;
        if(!r && b!=-1) odw[b]=1;
        for(auto i : V[a]) {
            if(!r) {
                if(T[i].st.st==a && odl[T[i].st.nd][p]==INF) {
                    q.push({-o-T[i].nd.st, {T[i].st.nd, i}});
                }
            } else {
                if(T[i].st.nd==a && odl[T[i].st.st][p]==INF) {
                    q.push({-o-T[i].nd.st, {T[i].st.st, i}});
                }
            }
        }
    }
}
void dijkstra2(int v) {
    rep(i, n) odl[i][0]=mi[i]=INF;
    mi[v]=0;
    while(true) {
        int o=INF, a=-1;
        rep(i, n) if(mi[i]<o && odl[i][0]==INF) {
            o=mi[i];
            a=i;
        }
        if(a==-1) break;
        odl[a][0]=o;
        for(auto i : V[a]) if(T[i].st.st==a) mi[T[i].st.nd]=min(mi[T[i].st.nd], o+T[i].nd.st);
    }
}
int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> m;
    rep(i, m) {
        cin >> T[i].st.st >> T[i].st.nd >> T[i].nd.st >> T[i].nd.nd;
        --T[i].st.st;
        --T[i].st.nd;
        V[T[i].st.st].pb(i);
        V[T[i].st.nd].pb(i);
    }
    dijkstra1(0, 0, 0);
    dijkstra1(0, 1, 1);
    dijkstra1(n-1, 0, 2);
    dijkstra1(n-1, 1, 3);
    int ans=INF;
    if(odl[n-1][0]<INF && odl[0][2]<INF) ans=odl[n-1][0]+odl[0][2];
    rep(i, m) if(!odw[i]) {
        int a=odl[n-1][0], b=odl[0][2];
        if(odl[T[i].st.nd][0]<INF && odl[T[i].st.st][3]<INF) {
            a=min(a, odl[T[i].st.nd][0]+odl[T[i].st.st][3]+T[i].nd.st);
        }
        if(odl[T[i].st.nd][2]<INF && odl[T[i].st.st][1]<INF) {
            b=min(b, odl[T[i].st.nd][2]+odl[T[i].st.st][1]+T[i].nd.st);
        }
        if(a<INF && b<INF) ans=min(ans, a+b+T[i].nd.nd);
    }
    rep(i, m) if(odw[i]) {
        swap(T[i].st.st, T[i].st.nd);
        dijkstra2(0);
        if(odl[n-1][0]<INF) {
            int akt=odl[n-1][0];
            dijkstra2(n-1);
            if(odl[0][0]<INF) {
                akt+=odl[0][0];
                ans=min(ans, akt+T[i].nd.nd);
            }
        }
        swap(T[i].st.st, T[i].st.nd);
    }
    cout << (ans==INF?-1:ans) << '\n';
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 23 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 50 ms 388 KB Output is correct
4 Correct 55 ms 332 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 2 ms 332 KB Output is correct
10 Correct 41 ms 332 KB Output is correct
11 Correct 52 ms 344 KB Output is correct
12 Correct 47 ms 336 KB Output is correct
13 Correct 7 ms 332 KB Output is correct
14 Correct 33 ms 332 KB Output is correct
15 Correct 10 ms 332 KB Output is correct
16 Correct 29 ms 388 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 533 ms 2928 KB Output is correct
2 Correct 573 ms 3588 KB Output is correct
3 Correct 535 ms 3760 KB Output is correct
4 Correct 56 ms 460 KB Output is correct
5 Correct 35 ms 388 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 308 KB Output is correct
9 Correct 66 ms 3376 KB Output is correct
10 Correct 62 ms 3436 KB Output is correct
11 Correct 152 ms 3716 KB Output is correct
12 Correct 348 ms 3776 KB Output is correct
13 Correct 112 ms 3772 KB Output is correct
14 Correct 87 ms 3800 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 408 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 403 ms 1944 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 509 ms 2420 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 328 KB Output is correct
8 Correct 66 ms 2880 KB Output is correct
9 Correct 79 ms 2896 KB Output is correct
10 Correct 397 ms 3076 KB Output is correct
11 Correct 136 ms 3040 KB Output is correct
12 Correct 168 ms 3040 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 407 ms 3088 KB Output is correct
20 Correct 135 ms 3108 KB Output is correct
21 Correct 169 ms 3004 KB Output is correct
22 Correct 160 ms 3056 KB Output is correct

Subtask #4
63.0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 23 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 50 ms 388 KB Output is correct
4 Correct 55 ms 332 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 2 ms 332 KB Output is correct
10 Correct 41 ms 332 KB Output is correct
11 Correct 52 ms 344 KB Output is correct
12 Correct 47 ms 336 KB Output is correct
13 Correct 7 ms 332 KB Output is correct
14 Correct 33 ms 332 KB Output is correct
15 Correct 10 ms 332 KB Output is correct
16 Correct 29 ms 388 KB Output is correct
17 Correct 533 ms 2928 KB Output is correct
18 Correct 573 ms 3588 KB Output is correct
19 Correct 535 ms 3760 KB Output is correct
20 Correct 56 ms 460 KB Output is correct
21 Correct 35 ms 388 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 308 KB Output is correct
25 Correct 66 ms 3376 KB Output is correct
26 Correct 62 ms 3436 KB Output is correct
27 Correct 152 ms 3716 KB Output is correct
28 Correct 348 ms 3776 KB Output is correct
29 Correct 112 ms 3772 KB Output is correct
30 Correct 87 ms 3800 KB Output is correct
31 Correct 24 ms 408 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 403 ms 1944 KB Output is correct
34 Correct 1 ms 332 KB Output is correct
35 Correct 509 ms 2420 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Correct 1 ms 328 KB Output is correct
38 Correct 66 ms 2880 KB Output is correct
39 Correct 79 ms 2896 KB Output is correct
40 Correct 397 ms 3076 KB Output is correct
41 Correct 136 ms 3040 KB Output is correct
42 Correct 168 ms 3040 KB Output is correct
43 Correct 1 ms 332 KB Output is correct
44 Correct 1 ms 332 KB Output is correct
45 Correct 1 ms 332 KB Output is correct
46 Correct 1 ms 332 KB Output is correct
47 Correct 1 ms 332 KB Output is correct
48 Correct 1 ms 332 KB Output is correct
49 Correct 407 ms 3088 KB Output is correct
50 Correct 135 ms 3108 KB Output is correct
51 Correct 169 ms 3004 KB Output is correct
52 Correct 160 ms 3056 KB Output is correct
53 Correct 705 ms 3596 KB Output is correct
54 Correct 799 ms 3604 KB Output is correct
55 Correct 760 ms 3568 KB Output is correct
56 Correct 53 ms 332 KB Output is correct
57 Correct 47 ms 344 KB Output is correct
58 Correct 413 ms 2788 KB Output is correct
59 Correct 474 ms 2788 KB Output is correct
60 Correct 635 ms 2784 KB Output is correct
61 Correct 420 ms 2776 KB Output is correct
62 Correct 477 ms 2780 KB Output is correct
63 Correct 639 ms 2716 KB Output is correct
64 Correct 360 ms 3088 KB Output is correct
65 Correct 403 ms 2968 KB Output is correct
66 Correct 488 ms 2984 KB Output is correct
67 Correct 27 ms 3228 KB Output is correct
68 Correct 88 ms 3400 KB Output is correct
69 Correct 78 ms 3372 KB Output is correct
70 Correct 528 ms 3632 KB Output is correct
71 Correct 488 ms 3604 KB Output is correct
72 Correct 173 ms 3720 KB Output is correct
73 Correct 207 ms 3816 KB Output is correct
74 Correct 484 ms 3772 KB Output is correct