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답안 #591670

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
591670 2022-07-07T18:10:49 Z piOOE Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 126 ms 2856 KB 
#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const int N = 200, M = 50000;
const ll infL = 3e18;

bool in_s[M], in_n[M];
ll distS[N], distN[N], distAllS[N], distAllN[N], tmp[N];

int A[M], B[M], W[M], D[M], n, m;

void dijkstra(int s, vector<pair<int, int>> g[], ll dist[], bool need, bool in[], int blocked = -1) {
    fill(dist, dist + n, infL);
    dist[s] = 0;
    int S = s;
    vector<bool> was(n);
    vector<int> par(n, -1);
    while (s != -1) {
        was[s] = true;
        for (auto [to, i]: g[s]) {
            if (i != blocked && dist[to] > dist[s] + W[i]) {
                dist[to] = dist[s] + W[i];
                par[to] = i;
            }
        }
        int nxt = -1;
        for (int i = 0; i < n; ++i) {
            if (!was[i] && dist[i] != infL && (nxt == -1 || dist[nxt] > dist[i])) {
                nxt = i;
            }
        }
        s = nxt;
    }
    if (need) {
        for (int i = 0; i < n; ++i) {
            if (par[i] != -1) {
                in[par[i]] = true;
            }
        }
    }
}

vector<pair<int, int>> g[N], revg[N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> m;
    for (int i = 0; i < m; ++i) {
        cin >> A[i] >> B[i] >> W[i] >> D[i];
        --A[i], --B[i];
        g[A[i]].emplace_back(B[i], i);
        revg[B[i]].emplace_back(A[i], i);
    }
    dijkstra(n - 1, g, distN, true, in_n);
    dijkstra(0, g, distS, true, in_s);
    dijkstra(0, revg, distAllS, false, nullptr);
    dijkstra(n - 1, revg, distAllN, false, nullptr);
    ll ans = infL;
    ans = min(ans, distS[n - 1] + distN[0]);
    for (int i = 0; i < m; ++i) {
        ll valSN, valNS;
        if (in_s[i]) {
            dijkstra(0, g, tmp, false, nullptr, i);
            valSN = tmp[n - 1];
        } else {
            valSN = min(distS[n - 1], distS[B[i]] + W[i] + distAllN[A[i]]);
        }
        if (in_n[i]) {
            dijkstra(n - 1, g, tmp, false, nullptr, i);
            valNS = tmp[0];
        } else {
            valNS = min(distN[0], distN[B[i]] + W[i] + distAllS[A[i]]);
        }
        ans = min(ans, D[i] + valNS + valSN);
    }
    cout << (ans == infL ? -1 : ans);
    return 0;
}

Compilation message

ho_t4.cpp: In function 'void dijkstra(int, std::vector<std::pair<int, int> >*, ll*, bool, bool*, int)':
ho_t4.cpp:18:9: warning: unused variable 'S' [-Wunused-variable]
   18 |     int S = s;
      |         ^

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 35 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 43 ms 340 KB Output is correct
4 Correct 41 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 42 ms 412 KB Output is correct
11 Correct 40 ms 416 KB Output is correct
12 Correct 42 ms 412 KB Output is correct
13 Correct 11 ms 444 KB Output is correct
14 Correct 25 ms 340 KB Output is correct
15 Correct 24 ms 340 KB Output is correct
16 Correct 25 ms 344 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 82 ms 2552 KB Output is correct
2 Correct 80 ms 2752 KB Output is correct
3 Correct 87 ms 2812 KB Output is correct
4 Correct 39 ms 468 KB Output is correct
5 Correct 34 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 47 ms 2784 KB Output is correct
10 Correct 31 ms 2652 KB Output is correct
11 Correct 57 ms 2764 KB Output is correct
12 Correct 59 ms 2768 KB Output is correct
13 Correct 58 ms 2788 KB Output is correct
14 Correct 57 ms 2856 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 36 ms 340 KB Output is correct
2 Correct 4 ms 340 KB Output is correct
3 Correct 66 ms 2316 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 79 ms 2772 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 29 ms 2672 KB Output is correct
9 Correct 32 ms 2764 KB Output is correct
10 Correct 50 ms 2688 KB Output is correct
11 Correct 49 ms 2764 KB Output is correct
12 Correct 57 ms 2828 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 56 ms 2840 KB Output is correct
20 Correct 51 ms 2792 KB Output is correct
21 Correct 65 ms 2772 KB Output is correct
22 Correct 54 ms 2676 KB Output is correct

Subtask #4
63.0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 35 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 43 ms 340 KB Output is correct
4 Correct 41 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 42 ms 412 KB Output is correct
11 Correct 40 ms 416 KB Output is correct
12 Correct 42 ms 412 KB Output is correct
13 Correct 11 ms 444 KB Output is correct
14 Correct 25 ms 340 KB Output is correct
15 Correct 24 ms 340 KB Output is correct
16 Correct 25 ms 344 KB Output is correct
17 Correct 82 ms 2552 KB Output is correct
18 Correct 80 ms 2752 KB Output is correct
19 Correct 87 ms 2812 KB Output is correct
20 Correct 39 ms 468 KB Output is correct
21 Correct 34 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 47 ms 2784 KB Output is correct
26 Correct 31 ms 2652 KB Output is correct
27 Correct 57 ms 2764 KB Output is correct
28 Correct 59 ms 2768 KB Output is correct
29 Correct 58 ms 2788 KB Output is correct
30 Correct 57 ms 2856 KB Output is correct
31 Correct 36 ms 340 KB Output is correct
32 Correct 4 ms 340 KB Output is correct
33 Correct 66 ms 2316 KB Output is correct
34 Correct 2 ms 340 KB Output is correct
35 Correct 79 ms 2772 KB Output is correct
36 Correct 0 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 29 ms 2672 KB Output is correct
39 Correct 32 ms 2764 KB Output is correct
40 Correct 50 ms 2688 KB Output is correct
41 Correct 49 ms 2764 KB Output is correct
42 Correct 57 ms 2828 KB Output is correct
43 Correct 0 ms 340 KB Output is correct
44 Correct 1 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 1 ms 340 KB Output is correct
48 Correct 1 ms 340 KB Output is correct
49 Correct 56 ms 2840 KB Output is correct
50 Correct 51 ms 2792 KB Output is correct
51 Correct 65 ms 2772 KB Output is correct
52 Correct 54 ms 2676 KB Output is correct
53 Correct 83 ms 2700 KB Output is correct
54 Correct 87 ms 2784 KB Output is correct
55 Correct 93 ms 2652 KB Output is correct
56 Correct 39 ms 432 KB Output is correct
57 Correct 39 ms 344 KB Output is correct
58 Correct 74 ms 2108 KB Output is correct
59 Correct 75 ms 2208 KB Output is correct
60 Correct 70 ms 2132 KB Output is correct
61 Correct 75 ms 2220 KB Output is correct
62 Correct 78 ms 2304 KB Output is correct
63 Correct 71 ms 2236 KB Output is correct
64 Correct 126 ms 2368 KB Output is correct
65 Correct 106 ms 2420 KB Output is correct
66 Correct 99 ms 2388 KB Output is correct
67 Correct 13 ms 2012 KB Output is correct
68 Correct 35 ms 2760 KB Output is correct
69 Correct 30 ms 2708 KB Output is correct
70 Correct 57 ms 2764 KB Output is correct
71 Correct 64 ms 2784 KB Output is correct
72 Correct 58 ms 2720 KB Output is correct
73 Correct 70 ms 2848 KB Output is correct
74 Correct 56 ms 2824 KB Output is correct