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Submission #1064393

# Submission time Handle Problem Language Result Execution time Memory
1064393 2024-08-18T12:10:20 Z rembocoder Janjetina (COCI21_janjetina) C++17
110 / 110
 736 ms 28208 KB 
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

#define int int64_t

typedef tree<pair<int, int>, null_type, less<pair<int, int>>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

const int inf = 2e9;
const int mod = 1e9 + 7;

int ans = 0;
int k;
vector<vector<pair<int, int>>> g;
vector<vector<int>> centers;
vector<bool> del;
vector<int> sz;

void find_sz(int v, int p) {
    sz[v] = 1;
    for (auto to_w: g[v]) {
        int to = to_w.first, w = to_w.second;
        if (to == p || del[to]) {
            continue;
        }
        find_sz(to, v);
        sz[v] += sz[to];
    }
}

int find_center(int v, int p, int total_sz) {
    for (auto to_w: g[v]) {
        int to = to_w.first, w = to_w.second;
        if (to == p || del[to]) {
            continue;
        }
        if (sz[to] * 2 > total_sz) {
            return find_center(to, v, total_sz);
        }
    }
    return v;
}

void fill_list(int v, int p, int cur_max, int cur_dist, vector<pair<int, int>>& lst) {
    lst.push_back({cur_max, cur_dist});
    for (auto to_w: g[v]) {
        int to = to_w.first, w = to_w.second;
        if (to == p || del[to]) {
            continue;
        }
        fill_list(to, v, max(cur_max, w), cur_dist + 1, lst);
    }
}

void handle_center(int v) {
    del[v] = true;
    vector<vector<pair<int, int>>> lists; // {max_on_path, dist}
    vector<pair<int, int>> common_list;
    common_list.push_back({-inf, 0});
    for (auto to_w: g[v]) {
        int to = to_w.first, w = to_w.second;
        lists.push_back(vector<pair<int, int>>(0));
        if (!del[to]) {
            fill_list(to, -1, w, 1, lists.back());
        }
        sort(lists.back().begin(), lists.back().end());
        common_list.insert(common_list.end(), lists.back().begin(), lists.back().end());
    }
    sort(common_list.begin(), common_list.end());
    auto handle_list = [&](vector<pair<int, int>>& lst) {
        int counter = 0;
        int cur_ans = 0;
        ordered_set s;
        for (auto mx_dist: lst) {
            int mx = mx_dist.first, dist = mx_dist.second;
            cur_ans += s.order_of_key({mx - k - dist + 1, -1});
            s.insert({dist, counter++});
        }
        return cur_ans;
    };
    ans += handle_list(common_list);
    for (auto lst: lists) {
        ans -= handle_list(lst);
    }
}

void centroid_decomposition(int v) {
    find_sz(v, -1);
    v = find_center(v, -1, sz[v]);
    handle_center(v);
    del[v] = true;
    for (auto to_w: g[v]) {
        int to = to_w.first, w = to_w.second;
        if (!del[to]) {
            centroid_decomposition(to);
        }
    }
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n;
    cin >> n >> k;
    g.resize(n);
    for (int i = 0; i < n - 1; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        a--; b--;
        g[a].push_back({b, c});
        g[b].push_back({a, c});
    }
    del.resize(n);
    sz.resize(n);
    centers.resize(n);
    centroid_decomposition(0);
    cout << ans * 2 << '\n';
}

Compilation message

Main.cpp: In function 'void find_sz(int64_t, int64_t)':
Main.cpp:24:30: warning: unused variable 'w' [-Wunused-variable]
   24 |         int to = to_w.first, w = to_w.second;
      |                              ^
Main.cpp: In function 'int64_t find_center(int64_t, int64_t, int64_t)':
Main.cpp:35:30: warning: unused variable 'w' [-Wunused-variable]
   35 |         int to = to_w.first, w = to_w.second;
      |                              ^
Main.cpp: In function 'void centroid_decomposition(int64_t)':
Main.cpp:95:30: warning: unused variable 'w' [-Wunused-variable]
   95 |         int to = to_w.first, w = to_w.second;
      |                              ^

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 2 ms 604 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 724 KB Output is correct
8 Correct 3 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 2 ms 680 KB Output is correct
12 Correct 2 ms 600 KB Output is correct
13 Correct 3 ms 604 KB Output is correct
14 Correct 2 ms 604 KB Output is correct
15 Correct 2 ms 604 KB Output is correct
16 Correct 2 ms 604 KB Output is correct
17 Correct 2 ms 604 KB Output is correct
18 Correct 2 ms 600 KB Output is correct
19 Correct 2 ms 604 KB Output is correct
20 Correct 2 ms 604 KB Output is correct
21 Correct 2 ms 600 KB Output is correct
22 Correct 4 ms 604 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 456 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 2 ms 728 KB Output is correct
5 Correct 33 ms 3176 KB Output is correct
6 Correct 276 ms 14196 KB Output is correct
7 Correct 625 ms 27540 KB Output is correct
8 Correct 714 ms 27956 KB Output is correct
9 Correct 616 ms 27704 KB Output is correct
10 Correct 723 ms 28044 KB Output is correct
11 Correct 666 ms 27532 KB Output is correct
12 Correct 736 ms 27960 KB Output is correct
13 Correct 661 ms 27696 KB Output is correct
14 Correct 720 ms 28208 KB Output is correct
15 Correct 727 ms 27700 KB Output is correct
16 Correct 656 ms 27956 KB Output is correct
17 Correct 638 ms 27968 KB Output is correct
18 Correct 630 ms 27764 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 2 ms 604 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 724 KB Output is correct
8 Correct 3 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 2 ms 680 KB Output is correct
12 Correct 2 ms 600 KB Output is correct
13 Correct 3 ms 604 KB Output is correct
14 Correct 2 ms 604 KB Output is correct
15 Correct 2 ms 604 KB Output is correct
16 Correct 2 ms 604 KB Output is correct
17 Correct 2 ms 604 KB Output is correct
18 Correct 2 ms 600 KB Output is correct
19 Correct 2 ms 604 KB Output is correct
20 Correct 2 ms 604 KB Output is correct
21 Correct 2 ms 600 KB Output is correct
22 Correct 4 ms 604 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 456 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 2 ms 728 KB Output is correct
27 Correct 33 ms 3176 KB Output is correct
28 Correct 276 ms 14196 KB Output is correct
29 Correct 625 ms 27540 KB Output is correct
30 Correct 714 ms 27956 KB Output is correct
31 Correct 616 ms 27704 KB Output is correct
32 Correct 723 ms 28044 KB Output is correct
33 Correct 666 ms 27532 KB Output is correct
34 Correct 736 ms 27960 KB Output is correct
35 Correct 661 ms 27696 KB Output is correct
36 Correct 720 ms 28208 KB Output is correct
37 Correct 727 ms 27700 KB Output is correct
38 Correct 656 ms 27956 KB Output is correct
39 Correct 638 ms 27968 KB Output is correct
40 Correct 630 ms 27764 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 608 ms 27448 KB Output is correct
43 Correct 713 ms 27956 KB Output is correct
44 Correct 642 ms 27700 KB Output is correct
45 Correct 711 ms 27884 KB Output is correct
46 Correct 606 ms 27448 KB Output is correct
47 Correct 731 ms 27956 KB Output is correct
48 Correct 632 ms 27540 KB Output is correct
49 Correct 719 ms 27956 KB Output is correct
50 Correct 733 ms 27700 KB Output is correct
51 Correct 644 ms 27960 KB Output is correct
52 Correct 164 ms 22160 KB Output is correct
53 Correct 182 ms 22340 KB Output is correct
54 Correct 188 ms 22060 KB Output is correct
55 Correct 180 ms 22380 KB Output is correct
56 Correct 200 ms 22272 KB Output is correct
57 Correct 434 ms 21684 KB Output is correct
58 Correct 435 ms 22012 KB Output is correct
59 Correct 563 ms 22108 KB Output is correct
60 Correct 493 ms 22024 KB Output is correct
61 Correct 483 ms 22060 KB Output is correct
62 Correct 342 ms 21880 KB Output is correct
63 Correct 419 ms 22140 KB Output is correct
64 Correct 417 ms 22176 KB Output is correct
65 Correct 13 ms 1372 KB Output is correct
66 Correct 0 ms 348 KB Output is correct