oj.uz

Submission #1026629

# Submission time Handle Problem Language Result Execution time Memory
1026629 2024-07-18T08:45:47 Z adaawf Meetings 2 (JOI21_meetings2) C++17
100 / 100
 530 ms 54380 KB 
#include <iostream>
#include <set>
#include <stack>
#include <vector>
#include <algorithm>
using namespace std;
int s[200005], l[200005][19], d[200005], c[200005], dd[200005], da[200005], z = 0, ff[200005];
vector<int> g[200005];
vector<pair<int, int>> gg[200005];
set<int> t;
void dfs(int x, int p) {
    s[x] = 1;
    dd[x] = ++z;
    l[x][0] = p;
    for (int w : g[x]) {
        if (w == p) continue;
        c[x]++;
        d[w] = d[x] + 1;
        dfs(w, x);
        s[x] += s[w];
    }
    if (p != 0 && g[x].size() == 1) t.insert(x);
    da[x] = z;
}
int lca(int x, int y) {
    if (d[x] < d[y]) swap(x, y);
    int k = d[x] - d[y];
    for (int i = 18; i >= 0; i--) {
        if (k & (1 << i)) {
            x = l[x][i];
        }
    }
    if (x == y) return x;
    for (int i = 18; i >= 0; i--) {
        if (l[x][i] != l[y][i]) {
            x = l[x][i];
            y = l[y][i];
        }
    }
    return l[x][0];
}
bool cmp(int x, int y) {
    return dd[x] < dd[y];
}
int ma = 1;
void dfs2(int x, int p) {
    ff[x] = 0;
    for (auto w : gg[x]) {
        if (w.first == p) continue;
        //cout << x << " " << w.first << " " << w.second << '\n';
        dfs2(w.first, x);
        ma = max(ma, ff[w.first] + ff[x] + w.second + 1);
        ff[x] = max(ff[x], ff[w.first] + w.second);
    }
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n;
    cin >> n;
    for (int i = 1; i < n; i++) {
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    dfs(1, 0);
    for (int i = 1; i <= 18; i++) {
        for (int j = 1; j <= n; j++) {
            l[j][i] = l[l[j][i - 1]][i - 1];
        }
    }
    for (int i = 1; i <= n; i++) {
        if (i & 1) {
            cout << 1 << '\n';
            continue;
        }
        vector<int> v, vb, vv, va;
        ma = 1;
        for (int w : t) {
            if (n - s[w] < i / 2) continue;
            int res = 0, k = w;
            for (int j = 18; j >= 0; j--) {
                if (l[k][j] == 0) continue;
                if (n - s[l[k][j]] >= i / 2) {
                    k = l[k][j];
                    res += (1 << j);
                }
            }
            ma = max(ma, res + 2);
        }
        for (int w : t) {
            v.push_back(w);
            vb.push_back(w);
        }
        sort(vb.begin(), vb.end(), cmp);
        for (int i = 1; i < vb.size(); i++) v.push_back(lca(vb[i], vb[i - 1]));
        sort(v.begin(), v.end(), cmp);
        int h = 0;
        stack<int> ss;
        for (int w : v) {
            if (w == h) continue;
            h = w;
            while (!ss.empty()) {
                int p = ss.top();
                if (dd[p] <= dd[w] && da[w] <= da[p]) {
                    gg[p].push_back({w, d[w] - d[p]});
                    break;
                }
                ss.pop();
            }
            ss.push(h);
        }
        while (ss.size() > 1) ss.pop();
        dfs2(ss.top(), -1);
        for (int w : vb) {
            if (s[w] == i / 2) {
                vv.push_back(w);
                c[l[w][0]]--;
                if (c[l[w][0]] == 0) va.push_back(l[w][0]);
            }
        }
        for (int w : v) gg[w].clear();
        for (int w : vv) t.erase(w);
        for (int w : va) t.insert(w);
        cout << ma << '\n';
    }
}

Compilation message

meetings2.cpp: In function 'int main()':
meetings2.cpp:97:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |         for (int i = 1; i < vb.size(); i++) v.push_back(lca(vb[i], vb[i - 1]));
      |                         ~~^~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 16988 KB Output is correct
2 Correct 2 ms 16988 KB Output is correct
3 Correct 2 ms 16988 KB Output is correct
4 Correct 2 ms 16988 KB Output is correct
5 Correct 2 ms 16988 KB Output is correct
6 Correct 2 ms 16988 KB Output is correct
7 Correct 2 ms 16984 KB Output is correct
8 Correct 3 ms 16988 KB Output is correct
9 Correct 3 ms 16988 KB Output is correct
10 Correct 2 ms 16984 KB Output is correct
11 Correct 2 ms 16984 KB Output is correct
12 Correct 2 ms 17044 KB Output is correct
13 Correct 2 ms 16988 KB Output is correct
14 Correct 2 ms 17048 KB Output is correct
15 Correct 3 ms 16988 KB Output is correct
16 Correct 2 ms 16988 KB Output is correct
17 Correct 3 ms 16988 KB Output is correct
18 Correct 2 ms 16832 KB Output is correct
19 Correct 3 ms 16984 KB Output is correct
20 Correct 2 ms 16988 KB Output is correct
21 Correct 2 ms 16988 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 16988 KB Output is correct
2 Correct 2 ms 16988 KB Output is correct
3 Correct 2 ms 16988 KB Output is correct
4 Correct 2 ms 16988 KB Output is correct
5 Correct 2 ms 16988 KB Output is correct
6 Correct 2 ms 16988 KB Output is correct
7 Correct 2 ms 16984 KB Output is correct
8 Correct 3 ms 16988 KB Output is correct
9 Correct 3 ms 16988 KB Output is correct
10 Correct 2 ms 16984 KB Output is correct
11 Correct 2 ms 16984 KB Output is correct
12 Correct 2 ms 17044 KB Output is correct
13 Correct 2 ms 16988 KB Output is correct
14 Correct 2 ms 17048 KB Output is correct
15 Correct 3 ms 16988 KB Output is correct
16 Correct 2 ms 16988 KB Output is correct
17 Correct 3 ms 16988 KB Output is correct
18 Correct 2 ms 16832 KB Output is correct
19 Correct 3 ms 16984 KB Output is correct
20 Correct 2 ms 16988 KB Output is correct
21 Correct 2 ms 16988 KB Output is correct
22 Correct 8 ms 17240 KB Output is correct
23 Correct 8 ms 17244 KB Output is correct
24 Correct 7 ms 17244 KB Output is correct
25 Correct 8 ms 17392 KB Output is correct
26 Correct 7 ms 17244 KB Output is correct
27 Correct 8 ms 17244 KB Output is correct
28 Correct 7 ms 17260 KB Output is correct
29 Correct 7 ms 17244 KB Output is correct
30 Correct 7 ms 17300 KB Output is correct
31 Correct 8 ms 17244 KB Output is correct
32 Correct 7 ms 17244 KB Output is correct
33 Correct 4 ms 17240 KB Output is correct
34 Correct 6 ms 17244 KB Output is correct
35 Correct 5 ms 17500 KB Output is correct
36 Correct 6 ms 17244 KB Output is correct
37 Correct 6 ms 17476 KB Output is correct
38 Correct 5 ms 17460 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 16988 KB Output is correct
2 Correct 2 ms 16988 KB Output is correct
3 Correct 2 ms 16988 KB Output is correct
4 Correct 2 ms 16988 KB Output is correct
5 Correct 2 ms 16988 KB Output is correct
6 Correct 2 ms 16988 KB Output is correct
7 Correct 2 ms 16984 KB Output is correct
8 Correct 3 ms 16988 KB Output is correct
9 Correct 3 ms 16988 KB Output is correct
10 Correct 2 ms 16984 KB Output is correct
11 Correct 2 ms 16984 KB Output is correct
12 Correct 2 ms 17044 KB Output is correct
13 Correct 2 ms 16988 KB Output is correct
14 Correct 2 ms 17048 KB Output is correct
15 Correct 3 ms 16988 KB Output is correct
16 Correct 2 ms 16988 KB Output is correct
17 Correct 3 ms 16988 KB Output is correct
18 Correct 2 ms 16832 KB Output is correct
19 Correct 3 ms 16984 KB Output is correct
20 Correct 2 ms 16988 KB Output is correct
21 Correct 2 ms 16988 KB Output is correct
22 Correct 8 ms 17240 KB Output is correct
23 Correct 8 ms 17244 KB Output is correct
24 Correct 7 ms 17244 KB Output is correct
25 Correct 8 ms 17392 KB Output is correct
26 Correct 7 ms 17244 KB Output is correct
27 Correct 8 ms 17244 KB Output is correct
28 Correct 7 ms 17260 KB Output is correct
29 Correct 7 ms 17244 KB Output is correct
30 Correct 7 ms 17300 KB Output is correct
31 Correct 8 ms 17244 KB Output is correct
32 Correct 7 ms 17244 KB Output is correct
33 Correct 4 ms 17240 KB Output is correct
34 Correct 6 ms 17244 KB Output is correct
35 Correct 5 ms 17500 KB Output is correct
36 Correct 6 ms 17244 KB Output is correct
37 Correct 6 ms 17476 KB Output is correct
38 Correct 5 ms 17460 KB Output is correct
39 Correct 497 ms 46992 KB Output is correct
40 Correct 482 ms 46532 KB Output is correct
41 Correct 473 ms 47216 KB Output is correct
42 Correct 485 ms 47216 KB Output is correct
43 Correct 525 ms 47216 KB Output is correct
44 Correct 530 ms 47596 KB Output is correct
45 Correct 288 ms 50208 KB Output is correct
46 Correct 184 ms 47696 KB Output is correct
47 Correct 282 ms 50112 KB Output is correct
48 Correct 294 ms 53832 KB Output is correct
49 Correct 302 ms 46616 KB Output is correct
50 Correct 293 ms 54380 KB Output is correct
51 Correct 216 ms 53572 KB Output is correct