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Submission #286634

# Submission time Handle Problem Language Result Execution time Memory
286634 2020-08-30T15:48:30 Z valerikk Olympic Bus (JOI20_ho_t4) C++17
37 / 100
 1000 ms 4736 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long

const int N = 205, M = 5e4 + 7;
const int INF = 1e18 + 39;
struct Edge{
    int v, u, c, d;
    Edge() {}
    Edge(int v, int u, int c, int d) : v(v), u(u), c(c), d(d) {}
};

int n ,m;
Edge edg[M];

void dijks(int st, int d[], int p[], bool rev, vector<int> g[], int ign) {
    for (int i = 0; i < n; i++) {
        d[i] = INF;
        p[i] = -1;
    }
    d[st] = 0;
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> q;
    q.push({d[st], st});
    while (!q.empty()) {
        auto cur = q.top();
        q.pop();
        int v = cur.second;
        if (d[v] != cur.first)
            continue;
        for (auto id : g[v]) {
            if (id == ign) continue;
            int w = edg[id].c, u = rev ? edg[id].v : edg[id].u;
            if (d[v] + w < d[u]) {
                d[u] = d[v] + w;
                p[u] = id;
                q.push({d[u], u});
            }
        }
    }
}

vector<int> g[N], gr[N];
int d1[N], dn[N];
int d1r[N], dnr[N];
int p1[N], pn[N];
int p1r[N], pnr[N];
bool bad1[M], badn[M];
bool bad1r[M], badnr[M];
int tmp_d[N], tmp_p[N];

int get_d1(int v, int ign) {
    if (bad1[ign]) {
        dijks(0, tmp_d, tmp_p, 0, g, ign);
        return tmp_d[v];
    }
    return d1[v];
}

int get_dn(int v, int ign) {
    if (badn[ign]) {
        dijks(n - 1, tmp_d, tmp_p, 0, g, ign);
        return tmp_d[v];
    }
    return dn[v];
}

int get_d1r(int v, int ign) {
    if (bad1r[ign]) {
        dijks(0, tmp_d, tmp_p, 1, gr, ign);
        return tmp_d[v];
    }
    return d1r[v];
}

int get_dnr(int v, int ign) {
    if (badnr[ign]) {
        dijks(n - 1, tmp_d, tmp_p, 1, gr, ign);
        return tmp_d[v];
    }
    return dnr[v];
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
        cin >> edg[i].v >> edg[i].u >> edg[i].c >> edg[i].d;
        edg[i].v--;
        edg[i].u--;
        g[edg[i].v].push_back(i);
        gr[edg[i].u].push_back(i);
    }
    dijks(0, d1, p1, 0, g, -1);
    dijks(0, d1r, p1r, 1, gr, -1);
    dijks(n - 1, dn, pn, 0, g, -1);
    dijks(n - 1, dnr, pnr, 1, gr, -1);
    for (int i = 0; i < n; i++) {
        if (~p1[i])
            bad1[p1[i]] = 1;
        if (~pn[i])
            badn[pn[i]] = 1;
        if (~p1r[i])
            bad1r[p1r[i]] = 1;
        if (~pnr[i])
            badnr[pnr[i]] = 1;
    }
    int ans = min(INF, d1[n - 1] + dn[0]);
    for (int i = 0; i < m; ++i) {
        int dist1 = min(get_d1(n - 1, i), get_d1(edg[i].u, i) + get_dnr(edg[i].v, i) + edg[i].c);
        int distn = min(get_dn(0, i), get_dn(edg[i].u, i) + get_d1r(edg[i].v, i) + edg[i].c);
        ans = min(ans, dist1 + distn + edg[i].d);
    }
    if (ans == INF)
        cout << "-1\n";
    else
        cout << ans << '\n';
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 512 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 38 ms 512 KB Output is correct
4 Correct 41 ms 512 KB Output is correct
5 Correct 3 ms 512 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 54 ms 512 KB Output is correct
11 Correct 51 ms 512 KB Output is correct
12 Correct 54 ms 512 KB Output is correct
13 Correct 8 ms 512 KB Output is correct
14 Correct 25 ms 532 KB Output is correct
15 Correct 22 ms 512 KB Output is correct
16 Correct 23 ms 536 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 386 ms 3712 KB Output is correct
2 Correct 380 ms 4472 KB Output is correct
3 Correct 385 ms 4608 KB Output is correct
4 Correct 37 ms 512 KB Output is correct
5 Correct 18 ms 512 KB Output is correct
6 Correct 3 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 91 ms 4472 KB Output is correct
10 Correct 84 ms 4600 KB Output is correct
11 Correct 239 ms 4608 KB Output is correct
12 Correct 238 ms 4600 KB Output is correct
13 Correct 239 ms 4608 KB Output is correct
14 Correct 235 ms 4736 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 512 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 226 ms 3436 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 288 ms 4352 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 65 ms 4352 KB Output is correct
9 Correct 72 ms 4352 KB Output is correct
10 Correct 180 ms 4344 KB Output is correct
11 Correct 187 ms 4352 KB Output is correct
12 Correct 185 ms 4344 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 0 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 183 ms 4352 KB Output is correct
20 Correct 176 ms 4352 KB Output is correct
21 Correct 188 ms 4352 KB Output is correct
22 Correct 187 ms 4344 KB Output is correct

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 512 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 38 ms 512 KB Output is correct
4 Correct 41 ms 512 KB Output is correct
5 Correct 3 ms 512 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 54 ms 512 KB Output is correct
11 Correct 51 ms 512 KB Output is correct
12 Correct 54 ms 512 KB Output is correct
13 Correct 8 ms 512 KB Output is correct
14 Correct 25 ms 532 KB Output is correct
15 Correct 22 ms 512 KB Output is correct
16 Correct 23 ms 536 KB Output is correct
17 Correct 386 ms 3712 KB Output is correct
18 Correct 380 ms 4472 KB Output is correct
19 Correct 385 ms 4608 KB Output is correct
20 Correct 37 ms 512 KB Output is correct
21 Correct 18 ms 512 KB Output is correct
22 Correct 3 ms 384 KB Output is correct
23 Correct 1 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 91 ms 4472 KB Output is correct
26 Correct 84 ms 4600 KB Output is correct
27 Correct 239 ms 4608 KB Output is correct
28 Correct 238 ms 4600 KB Output is correct
29 Correct 239 ms 4608 KB Output is correct
30 Correct 235 ms 4736 KB Output is correct
31 Correct 27 ms 512 KB Output is correct
32 Correct 3 ms 384 KB Output is correct
33 Correct 226 ms 3436 KB Output is correct
34 Correct 2 ms 384 KB Output is correct
35 Correct 288 ms 4352 KB Output is correct
36 Correct 1 ms 384 KB Output is correct
37 Correct 0 ms 384 KB Output is correct
38 Correct 65 ms 4352 KB Output is correct
39 Correct 72 ms 4352 KB Output is correct
40 Correct 180 ms 4344 KB Output is correct
41 Correct 187 ms 4352 KB Output is correct
42 Correct 185 ms 4344 KB Output is correct
43 Correct 1 ms 384 KB Output is correct
44 Correct 1 ms 384 KB Output is correct
45 Correct 1 ms 384 KB Output is correct
46 Correct 0 ms 384 KB Output is correct
47 Correct 1 ms 384 KB Output is correct
48 Correct 0 ms 384 KB Output is correct
49 Correct 183 ms 4352 KB Output is correct
50 Correct 176 ms 4352 KB Output is correct
51 Correct 188 ms 4352 KB Output is correct
52 Correct 187 ms 4344 KB Output is correct
53 Correct 416 ms 4472 KB Output is correct
54 Correct 392 ms 4344 KB Output is correct
55 Correct 397 ms 4344 KB Output is correct
56 Correct 40 ms 512 KB Output is correct
57 Correct 52 ms 512 KB Output is correct
58 Correct 341 ms 3576 KB Output is correct
59 Correct 354 ms 3704 KB Output is correct
60 Correct 359 ms 3576 KB Output is correct
61 Correct 326 ms 3712 KB Output is correct
62 Correct 343 ms 3704 KB Output is correct
63 Correct 347 ms 3704 KB Output is correct
64 Execution timed out 1094 ms 4304 KB Time limit exceeded
65 Halted 0 ms 0 KB -