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Submission #367696

# Submission time Handle Problem Language Result Execution time Memory
367696 2021-02-18T03:28:13 Z arujbansal Relay Marathon (NOI20_relaymarathon) C++17
17 / 100
 6000 ms 107452 KB 
#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <array>
#include <stack>
#include <queue>
#include <random>
#include <numeric>
#include <functional>
#include <chrono>
#include <utility>
#include <iomanip>
#include <assert.h>

using namespace std;

void dbg_out() { cerr << endl; }
template<typename Head, typename... Tail>
void dbg_out(Head H, Tail... T) { cerr << ' ' << H; dbg_out(T...); }
#define dbg(...) cerr << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)

#define rng_init mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define rng_seed(x) mt19937 rng(x)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int) (x).size()
// #define int long long

rng_init;

const int MXN = 1e5 + 5, INF = 1e9 + 5;
int N, M, K;
vector<pair<int, int>> g[MXN];
vector<array<int, 3>> edges;
vector<int> src[2];
int dist[2][MXN], par[2][MXN];

void dijkstra(int which) {
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<>> pq;

    for (int i = 0; i < N; i++) {
        dist[which][i] = INF;
        par[which][i] = i;
    }
    
    for (const auto &x : src[which]) {
        dist[which][x] = 0;
        pq.emplace(0, x);
    }

    while (!pq.empty()) {
        auto cur = pq.top();
        pq.pop();

        int u = cur.second, cur_dist = cur.first;
        if (cur_dist > dist[which][u]) continue;

        for (const auto &[v, wt] : g[u]) {
            int new_dist = cur_dist + wt;

            if (new_dist < dist[which][v]) {
                dist[which][v] = new_dist;
                pq.emplace(new_dist, v);

                par[which][v] = par[which][u];
            }
        }
    }
}

int closest_pair(int which) {
    int pair_dist = INF;

    for (const auto &[u, v, wt] : edges) {
        if (par[which][u] == par[which][v]) continue;

        pair_dist = min(pair_dist, dist[which][u] + wt + dist[which][v]);
    }

    return pair_dist;
}

void solve() {
    cin >> N >> M >> K;

    for (int i = 0; i < M; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        u--, v--;

        edges.push_back({u, v, w});

        g[u].emplace_back(v, w);
        g[v].emplace_back(u, w);
    }

    vector<int> special(K);
    for (auto &x : special) {
        cin >> x;
        x--;
    }

    int ans = INF;

    for (int iter = 0; iter < 45; iter++) {
        src[0].clear(), src[1].clear();

        shuffle(all(special), rng);

        for (int i = 0; i < K; i++)
            src[i >= K / 2].push_back(special[i]);

        for (int i = 0; i < 2; i++)
            dijkstra(i);

        ans = min(ans, closest_pair(0) + closest_pair(1));
    }

    cout << ans;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int TC = 1;
    // cin >> TC;
    while (TC--) solve();
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2796 KB Output is correct
2 Correct 4 ms 2796 KB Output is correct
3 Correct 3 ms 2668 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 2 ms 2668 KB Output is correct
6 Correct 2 ms 2668 KB Output is correct
7 Correct 4 ms 2796 KB Output is correct
8 Correct 4 ms 2796 KB Output is correct
9 Correct 2 ms 2668 KB Output is correct
10 Correct 2 ms 2668 KB Output is correct
11 Correct 3 ms 2668 KB Output is correct
12 Correct 3 ms 2668 KB Output is correct
13 Correct 4 ms 2796 KB Output is correct
14 Correct 4 ms 2796 KB Output is correct
15 Correct 5 ms 2796 KB Output is correct
16 Correct 3 ms 2668 KB Output is correct
17 Correct 4 ms 2796 KB Output is correct
18 Correct 3 ms 2668 KB Output is correct
19 Correct 4 ms 2796 KB Output is correct
20 Correct 3 ms 2668 KB Output is correct
21 Correct 4 ms 2796 KB Output is correct
22 Correct 2 ms 2668 KB Output is correct
23 Correct 4 ms 2796 KB Output is correct
24 Correct 3 ms 2688 KB Output is correct
25 Correct 2 ms 2668 KB Output is correct
26 Correct 3 ms 2668 KB Output is correct
27 Correct 2 ms 2668 KB Output is correct
28 Correct 4 ms 2796 KB Output is correct
29 Correct 4 ms 2796 KB Output is correct
30 Correct 4 ms 2796 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2796 KB Output is correct
2 Correct 4 ms 2796 KB Output is correct
3 Correct 3 ms 2668 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 2 ms 2668 KB Output is correct
6 Correct 2 ms 2668 KB Output is correct
7 Correct 4 ms 2796 KB Output is correct
8 Correct 4 ms 2796 KB Output is correct
9 Correct 2 ms 2668 KB Output is correct
10 Correct 2 ms 2668 KB Output is correct
11 Correct 3 ms 2668 KB Output is correct
12 Correct 3 ms 2668 KB Output is correct
13 Correct 4 ms 2796 KB Output is correct
14 Correct 4 ms 2796 KB Output is correct
15 Correct 5 ms 2796 KB Output is correct
16 Correct 3 ms 2668 KB Output is correct
17 Correct 4 ms 2796 KB Output is correct
18 Correct 3 ms 2668 KB Output is correct
19 Correct 4 ms 2796 KB Output is correct
20 Correct 3 ms 2668 KB Output is correct
21 Correct 4 ms 2796 KB Output is correct
22 Correct 2 ms 2668 KB Output is correct
23 Correct 4 ms 2796 KB Output is correct
24 Correct 3 ms 2688 KB Output is correct
25 Correct 2 ms 2668 KB Output is correct
26 Correct 3 ms 2668 KB Output is correct
27 Correct 2 ms 2668 KB Output is correct
28 Correct 4 ms 2796 KB Output is correct
29 Correct 4 ms 2796 KB Output is correct
30 Correct 4 ms 2796 KB Output is correct
31 Correct 5 ms 2796 KB Output is correct
32 Correct 7 ms 2796 KB Output is correct
33 Correct 8 ms 2796 KB Output is correct
34 Correct 3 ms 2668 KB Output is correct
35 Correct 3 ms 2668 KB Output is correct
36 Correct 19 ms 2924 KB Output is correct
37 Correct 24 ms 3052 KB Output is correct
38 Correct 10 ms 2796 KB Output is correct
39 Correct 96 ms 7076 KB Output is correct
40 Correct 38 ms 3820 KB Output is correct
41 Correct 10 ms 2796 KB Output is correct
42 Correct 33 ms 3820 KB Output is correct
43 Correct 17 ms 2924 KB Output is correct
44 Correct 10 ms 2796 KB Output is correct
45 Correct 3 ms 2668 KB Output is correct
46 Correct 98 ms 7456 KB Output is correct
47 Correct 31 ms 3308 KB Output is correct
48 Correct 91 ms 7076 KB Output is correct
49 Correct 89 ms 7204 KB Output is correct
50 Correct 9 ms 2924 KB Output is correct
51 Correct 11 ms 2796 KB Output is correct
52 Correct 9 ms 2796 KB Output is correct
53 Correct 68 ms 5156 KB Output is correct
54 Correct 105 ms 7076 KB Output is correct
55 Correct 7 ms 2796 KB Output is correct
56 Correct 4 ms 2668 KB Output is correct
57 Correct 8 ms 2796 KB Output is correct
58 Correct 111 ms 7712 KB Output is correct
59 Correct 3 ms 2668 KB Output is correct
60 Correct 12 ms 2796 KB Output is correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1493 ms 7984 KB Output is correct
2 Correct 19 ms 4972 KB Output is correct
3 Execution timed out 6055 ms 107452 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 58.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2796 KB Output is correct
2 Correct 4 ms 2796 KB Output is correct
3 Correct 3 ms 2668 KB Output is correct
4 Correct 2 ms 2668 KB Output is correct
5 Correct 2 ms 2668 KB Output is correct
6 Correct 2 ms 2668 KB Output is correct
7 Correct 4 ms 2796 KB Output is correct
8 Correct 4 ms 2796 KB Output is correct
9 Correct 2 ms 2668 KB Output is correct
10 Correct 2 ms 2668 KB Output is correct
11 Correct 3 ms 2668 KB Output is correct
12 Correct 3 ms 2668 KB Output is correct
13 Correct 4 ms 2796 KB Output is correct
14 Correct 4 ms 2796 KB Output is correct
15 Correct 5 ms 2796 KB Output is correct
16 Correct 3 ms 2668 KB Output is correct
17 Correct 4 ms 2796 KB Output is correct
18 Correct 3 ms 2668 KB Output is correct
19 Correct 4 ms 2796 KB Output is correct
20 Correct 3 ms 2668 KB Output is correct
21 Correct 4 ms 2796 KB Output is correct
22 Correct 2 ms 2668 KB Output is correct
23 Correct 4 ms 2796 KB Output is correct
24 Correct 3 ms 2688 KB Output is correct
25 Correct 2 ms 2668 KB Output is correct
26 Correct 3 ms 2668 KB Output is correct
27 Correct 2 ms 2668 KB Output is correct
28 Correct 4 ms 2796 KB Output is correct
29 Correct 4 ms 2796 KB Output is correct
30 Correct 4 ms 2796 KB Output is correct
31 Correct 5 ms 2796 KB Output is correct
32 Correct 7 ms 2796 KB Output is correct
33 Correct 8 ms 2796 KB Output is correct
34 Correct 3 ms 2668 KB Output is correct
35 Correct 3 ms 2668 KB Output is correct
36 Correct 19 ms 2924 KB Output is correct
37 Correct 24 ms 3052 KB Output is correct
38 Correct 10 ms 2796 KB Output is correct
39 Correct 96 ms 7076 KB Output is correct
40 Correct 38 ms 3820 KB Output is correct
41 Correct 10 ms 2796 KB Output is correct
42 Correct 33 ms 3820 KB Output is correct
43 Correct 17 ms 2924 KB Output is correct
44 Correct 10 ms 2796 KB Output is correct
45 Correct 3 ms 2668 KB Output is correct
46 Correct 98 ms 7456 KB Output is correct
47 Correct 31 ms 3308 KB Output is correct
48 Correct 91 ms 7076 KB Output is correct
49 Correct 89 ms 7204 KB Output is correct
50 Correct 9 ms 2924 KB Output is correct
51 Correct 11 ms 2796 KB Output is correct
52 Correct 9 ms 2796 KB Output is correct
53 Correct 68 ms 5156 KB Output is correct
54 Correct 105 ms 7076 KB Output is correct
55 Correct 7 ms 2796 KB Output is correct
56 Correct 4 ms 2668 KB Output is correct
57 Correct 8 ms 2796 KB Output is correct
58 Correct 111 ms 7712 KB Output is correct
59 Correct 3 ms 2668 KB Output is correct
60 Correct 12 ms 2796 KB Output is correct
61 Correct 1493 ms 7984 KB Output is correct
62 Correct 19 ms 4972 KB Output is correct
63 Execution timed out 6055 ms 107452 KB Time limit exceeded
64 Halted 0 ms 0 KB -