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Submission #955661

# Submission time Handle Problem Language Result Execution time Memory
955661 2024-03-31T09:31:40 Z Lukap Meetings 2 (JOI21_meetings2) C++14
100 / 100
 605 ms 29132 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int MAXN = 2e5 + 500;
const ll INF = 1e18;

int n;
vector<int> susjedi[MAXN], v;
int rj[2 * MAXN], bio[MAXN], d[MAXN], w[MAXN], flag[MAXN];

void dfs (int x, int p) {
    w[x] = 1;
    v.push_back (x);
    for (auto nx: susjedi[x]) {
        if (nx == p || bio[nx]) continue;
        d[nx] = d[x] + 1;
        dfs (nx, x);
        w[x] += w[nx];
    }
}

void postavi_flag (int x, int p, int r) {
    flag[x] = r;
    for (auto nx: susjedi[x]) {
        if (nx == p || bio[nx]) continue;
        postavi_flag(nx, x, r);
    }
}

bool cmp (int x, int y) {
    return w[x] > w[y];
}

void centroid (int x) {
    v.clear ();
    d[x] = 0;
    dfs (x, x);

    for (auto it: v) {
        bool dobro = true;
        for (auto nx: susjedi[it]) {
            if (bio[nx]) continue;
            if (d[it] < d[nx] && w[nx] > v.size () / 2) dobro = false;
            if (d[nx] < d[it] && v.size () - w[it] > v.size () / 2) dobro = false;
        }
        if (dobro) x = it;
    }
    v.clear ();
    d[x] = 0;
    dfs (x, x);

    for (auto it: susjedi[x]) {
        if (bio[it]) continue;
        postavi_flag (it, x, it);
    }

    for (auto it: v) {
        if (it == x) continue;
        int ind  = min (w[it], (int) v.size () - w[flag[it]]);
        rj[ind] = max (rj[ind], d[it] + 1);
    }
    v.erase (find (v.begin (), v.end (), x));
    sort (v.begin (), v.end (), cmp);

    int prvi = -1, drugi = -1;
    for (auto it: v) {
        if (prvi == -1) {
            prvi = it;
            continue;
        }
        else if (drugi == -1 && flag[it] != flag[prvi]) drugi = it;
        else if (drugi == -1 && flag[it] == flag[prvi] && d[it] > d[prvi]) {
            prvi = it;
            continue;
        }
        else if (drugi == -1 && flag[it] == flag[prvi]) continue;
        else if (d[it] > d[prvi] && flag[it] != flag[prvi]) {
            drugi = prvi;
            prvi = it;
        }
        else if (d[it] > d[prvi] && flag[it] == flag[prvi]) prvi = it;
        else if (d[it] > d[drugi] && flag[it] != flag[prvi]) drugi = it;

        int ind = min (w[prvi], w[drugi]);
        rj[ind] = max (rj[ind], d[prvi] + d[drugi] + 1);
    }


    bio[x] = 1;
    for (auto it: susjedi[x]) {
        if (!bio[it]) centroid (it);
    }
}

int main () {
    ios_base::sync_with_stdio (false);
    cin.tie (0);

    cin >> n;
    for (int i = 0; i < n - 1; i++) {
        int a, b;
        cin >> a >> b;
        a--;b--;
        susjedi[b].push_back (a);
        susjedi[a].push_back (b);
    }
    centroid (0);

    for (int i = n; i > 0; i--) rj[i] = max (max (rj[i], rj[i + 1]), 1);
    for (int i = n; i > 0; i--) rj[2 * i] = rj[i];
    for (int i = 1; i <= n; i+= 2) rj[i] = 1;

    for (int i = 1; i <= n; i++) cout << rj[i] << "\n";

    return 0;
}

Compilation message

meetings2.cpp: In function 'void centroid(int)':
meetings2.cpp:46:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |             if (d[it] < d[nx] && w[nx] > v.size () / 2) dobro = false;
      |                                  ~~~~~~^~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9560 KB Output is correct
2 Correct 2 ms 7512 KB Output is correct
3 Correct 2 ms 7516 KB Output is correct
4 Correct 3 ms 7516 KB Output is correct
5 Correct 2 ms 7516 KB Output is correct
6 Correct 2 ms 7516 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 2 ms 7516 KB Output is correct
9 Correct 2 ms 7516 KB Output is correct
10 Correct 2 ms 7516 KB Output is correct
11 Correct 2 ms 7516 KB Output is correct
12 Correct 2 ms 7516 KB Output is correct
13 Correct 2 ms 7516 KB Output is correct
14 Correct 2 ms 7516 KB Output is correct
15 Correct 2 ms 7516 KB Output is correct
16 Correct 2 ms 7516 KB Output is correct
17 Correct 2 ms 7516 KB Output is correct
18 Correct 2 ms 7516 KB Output is correct
19 Correct 2 ms 7516 KB Output is correct
20 Correct 2 ms 7516 KB Output is correct
21 Correct 2 ms 7516 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9560 KB Output is correct
2 Correct 2 ms 7512 KB Output is correct
3 Correct 2 ms 7516 KB Output is correct
4 Correct 3 ms 7516 KB Output is correct
5 Correct 2 ms 7516 KB Output is correct
6 Correct 2 ms 7516 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 2 ms 7516 KB Output is correct
9 Correct 2 ms 7516 KB Output is correct
10 Correct 2 ms 7516 KB Output is correct
11 Correct 2 ms 7516 KB Output is correct
12 Correct 2 ms 7516 KB Output is correct
13 Correct 2 ms 7516 KB Output is correct
14 Correct 2 ms 7516 KB Output is correct
15 Correct 2 ms 7516 KB Output is correct
16 Correct 2 ms 7516 KB Output is correct
17 Correct 2 ms 7516 KB Output is correct
18 Correct 2 ms 7516 KB Output is correct
19 Correct 2 ms 7516 KB Output is correct
20 Correct 2 ms 7516 KB Output is correct
21 Correct 2 ms 7516 KB Output is correct
22 Correct 5 ms 7772 KB Output is correct
23 Correct 5 ms 7768 KB Output is correct
24 Correct 5 ms 7772 KB Output is correct
25 Correct 5 ms 7772 KB Output is correct
26 Correct 6 ms 7904 KB Output is correct
27 Correct 5 ms 7772 KB Output is correct
28 Correct 5 ms 7776 KB Output is correct
29 Correct 5 ms 7904 KB Output is correct
30 Correct 5 ms 7900 KB Output is correct
31 Correct 5 ms 7772 KB Output is correct
32 Correct 6 ms 8028 KB Output is correct
33 Correct 6 ms 8280 KB Output is correct
34 Correct 3 ms 7772 KB Output is correct
35 Correct 3 ms 7752 KB Output is correct
36 Correct 5 ms 7772 KB Output is correct
37 Correct 3 ms 7768 KB Output is correct
38 Correct 4 ms 8024 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9560 KB Output is correct
2 Correct 2 ms 7512 KB Output is correct
3 Correct 2 ms 7516 KB Output is correct
4 Correct 3 ms 7516 KB Output is correct
5 Correct 2 ms 7516 KB Output is correct
6 Correct 2 ms 7516 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 2 ms 7516 KB Output is correct
9 Correct 2 ms 7516 KB Output is correct
10 Correct 2 ms 7516 KB Output is correct
11 Correct 2 ms 7516 KB Output is correct
12 Correct 2 ms 7516 KB Output is correct
13 Correct 2 ms 7516 KB Output is correct
14 Correct 2 ms 7516 KB Output is correct
15 Correct 2 ms 7516 KB Output is correct
16 Correct 2 ms 7516 KB Output is correct
17 Correct 2 ms 7516 KB Output is correct
18 Correct 2 ms 7516 KB Output is correct
19 Correct 2 ms 7516 KB Output is correct
20 Correct 2 ms 7516 KB Output is correct
21 Correct 2 ms 7516 KB Output is correct
22 Correct 5 ms 7772 KB Output is correct
23 Correct 5 ms 7768 KB Output is correct
24 Correct 5 ms 7772 KB Output is correct
25 Correct 5 ms 7772 KB Output is correct
26 Correct 6 ms 7904 KB Output is correct
27 Correct 5 ms 7772 KB Output is correct
28 Correct 5 ms 7776 KB Output is correct
29 Correct 5 ms 7904 KB Output is correct
30 Correct 5 ms 7900 KB Output is correct
31 Correct 5 ms 7772 KB Output is correct
32 Correct 6 ms 8028 KB Output is correct
33 Correct 6 ms 8280 KB Output is correct
34 Correct 3 ms 7772 KB Output is correct
35 Correct 3 ms 7752 KB Output is correct
36 Correct 5 ms 7772 KB Output is correct
37 Correct 3 ms 7768 KB Output is correct
38 Correct 4 ms 8024 KB Output is correct
39 Correct 404 ms 19812 KB Output is correct
40 Correct 413 ms 19576 KB Output is correct
41 Correct 373 ms 19816 KB Output is correct
42 Correct 330 ms 20168 KB Output is correct
43 Correct 324 ms 20032 KB Output is correct
44 Correct 318 ms 20172 KB Output is correct
45 Correct 605 ms 25052 KB Output is correct
46 Correct 574 ms 29132 KB Output is correct
47 Correct 109 ms 20328 KB Output is correct
48 Correct 115 ms 20868 KB Output is correct
49 Correct 298 ms 20684 KB Output is correct
50 Correct 99 ms 20552 KB Output is correct
51 Correct 315 ms 27852 KB Output is correct