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Submission #804454

# Submission time Handle Problem Language Result Execution time Memory
804454 2023-08-03T08:48:21 Z vjudge1 Meetings 2 (JOI21_meetings2) C++17
4 / 100
 51 ms 16352 KB 
#include<bits/stdc++.h>

using namespace std;
using ll = long long;

const int B = 800;
const int N = 3e5 + 10;
const int INF = 1e9;
vector<int> g[N];

int n;
int sz[N];
int anc[N][20];
int tin[N], tout[N], T, depth[N];
void precalc(int s, int p) {
    sz[s] = 1;
    anc[s][0] = p;
    tin[s] = T++;
    for(int i = 1; i < 20; i++) 
        anc[s][i] = anc[anc[s][i - 1]][i - 1];
    for(int to : g[s]) {
        if(to == p) continue;
        depth[to] = depth[s] + 1;
        precalc(to, s);
        sz[s] += sz[to];
    }
    tout[s] = T++;
}
bool up(int u, int v) {
    return tin[u] <= tin[v] && tout[u] >= tout[v];
}
int lca(int u, int v) {
    if(up(u, v)) return u;
    if(up(v, u)) return v;
    for(int i = 19; i >= 0; i--) {
        if(!up(anc[u][i], v)) u = anc[u][i];
    }
    return anc[u][0];
}
int dist(int u, int v) {
    return depth[u] + depth[v] - 2 * depth[lca(u, v)];
}

int root;
vector<int> rs(N, 1);

int LIM;
int dfs(int s, int p, int k) {
    if(k > LIM) return 0;
    int f = -INF;
    if(sz[s] >= k) f = 0;
    int mx0 = -INF, mx1 = -INF;

    for(int to : g[s]) {
        if(to == p) continue;
        int x = dfs(to, s, k);
        if(x >= mx0) mx1 = mx0, mx0 = x;
        else if(x > mx1) mx1 = x;
        f = max(f, x + 1);
    }
    rs[2 * k] = max(rs[2 * k], mx0 + mx1 + 2 + (s != root));
    return f;
}

int func(int u, int v) {
    if(sz[u] < sz[v]) swap(u, v);
    return min(sz[v], n - sz[v]);
}
vector<int> ver[N];
int lb[N];

void DFS(int s, int p) {
    lb[s] = B + 1;
    for(int to : g[s]) {
        if(to == p) continue;
        DFS(to, s);
        lb[s] = max(lb[to], lb[s]);
    }
    while(lb[s] <= min(sz[s], LIM)) {
        ver[lb[s]++].push_back(s); 
    }
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin >> n;
    vector<pair<int, int>> edges;
    for(int i = 1; i < n; i++) {
        int a, b;
        cin >> a >> b;
        edges.push_back({a, b});
        g[a].push_back(b);
        g[b].push_back(a);
    }
    if(n == 1) {
        cout << 1;
        return 0;
    }

    precalc(1, 1);
    int x0 = edges[0].first, x1 = edges[0].second;
    for(auto [u, v] : edges) {
        if(func(x0, x1) < func(u, v)) {
            x0 = u;
            x1 = v;
        }
    }
    LIM = func(x0, x1);
    g[x0].erase(find(g[x0].begin(), g[x0].end(), x1));
    g[x1].erase(find(g[x1].begin(), g[x1].end(), x0));
    root = n + 1;
    g[root].push_back(x0);
    g[root].push_back(x1);
    precalc(root, root);

    for(int i = 1; i <= B; i++) 
        dfs(root, root, i);
    
    DFS(root, root);
    // cout << LIM << '\n';
    for(int i = B + 1; i <= LIM; i++) {
        if(ver[i].size() < 2) break;
        int x = ver[i][0], y = ver[i][1];
        for(int c : ver[i]) {
            if(depth[c] > depth[x]) x = c;
        }
        for(int c : ver[i]) {
            if(dist(c, x) > dist(y, x)) y = c; 
        }
        rs[2 * i] = dist(x, y);
        if(lca(x, y) != root) rs[2 * i]++;
    }
    for(int i = 1; i <= n; i++) 
        cout << rs[i] << '\n';
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 15572 KB Output is correct
2 Correct 8 ms 15572 KB Output is correct
3 Correct 7 ms 15572 KB Output is correct
4 Correct 7 ms 15572 KB Output is correct
5 Correct 7 ms 15572 KB Output is correct
6 Correct 7 ms 15572 KB Output is correct
7 Correct 8 ms 15628 KB Output is correct
8 Correct 8 ms 15628 KB Output is correct
9 Correct 7 ms 15532 KB Output is correct
10 Correct 7 ms 15620 KB Output is correct
11 Correct 7 ms 15572 KB Output is correct
12 Correct 6 ms 15572 KB Output is correct
13 Correct 6 ms 15572 KB Output is correct
14 Correct 6 ms 15572 KB Output is correct
15 Correct 7 ms 15572 KB Output is correct
16 Correct 7 ms 15508 KB Output is correct
17 Correct 6 ms 15572 KB Output is correct
18 Correct 7 ms 15524 KB Output is correct
19 Correct 7 ms 15572 KB Output is correct
20 Correct 7 ms 15572 KB Output is correct
21 Correct 7 ms 15572 KB Output is correct

Subtask #2
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 15572 KB Output is correct
2 Correct 8 ms 15572 KB Output is correct
3 Correct 7 ms 15572 KB Output is correct
4 Correct 7 ms 15572 KB Output is correct
5 Correct 7 ms 15572 KB Output is correct
6 Correct 7 ms 15572 KB Output is correct
7 Correct 8 ms 15628 KB Output is correct
8 Correct 8 ms 15628 KB Output is correct
9 Correct 7 ms 15532 KB Output is correct
10 Correct 7 ms 15620 KB Output is correct
11 Correct 7 ms 15572 KB Output is correct
12 Correct 6 ms 15572 KB Output is correct
13 Correct 6 ms 15572 KB Output is correct
14 Correct 6 ms 15572 KB Output is correct
15 Correct 7 ms 15572 KB Output is correct
16 Correct 7 ms 15508 KB Output is correct
17 Correct 6 ms 15572 KB Output is correct
18 Correct 7 ms 15524 KB Output is correct
19 Correct 7 ms 15572 KB Output is correct
20 Correct 7 ms 15572 KB Output is correct
21 Correct 7 ms 15572 KB Output is correct
22 Correct 47 ms 16156 KB Output is correct
23 Correct 42 ms 16176 KB Output is correct
24 Correct 44 ms 16084 KB Output is correct
25 Correct 51 ms 16204 KB Output is correct
26 Correct 44 ms 16160 KB Output is correct
27 Correct 44 ms 16172 KB Output is correct
28 Correct 44 ms 16176 KB Output is correct
29 Correct 45 ms 16172 KB Output is correct
30 Correct 43 ms 16152 KB Output is correct
31 Correct 44 ms 16160 KB Output is correct
32 Correct 47 ms 16268 KB Output is correct
33 Correct 44 ms 16352 KB Output is correct
34 Correct 11 ms 16084 KB Output is correct
35 Correct 10 ms 16112 KB Output is correct
36 Correct 36 ms 16192 KB Output is correct
37 Correct 28 ms 16180 KB Output is correct
38 Incorrect 36 ms 16260 KB Output isn't correct
39 Halted 0 ms 0 KB -

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 15572 KB Output is correct
2 Correct 8 ms 15572 KB Output is correct
3 Correct 7 ms 15572 KB Output is correct
4 Correct 7 ms 15572 KB Output is correct
5 Correct 7 ms 15572 KB Output is correct
6 Correct 7 ms 15572 KB Output is correct
7 Correct 8 ms 15628 KB Output is correct
8 Correct 8 ms 15628 KB Output is correct
9 Correct 7 ms 15532 KB Output is correct
10 Correct 7 ms 15620 KB Output is correct
11 Correct 7 ms 15572 KB Output is correct
12 Correct 6 ms 15572 KB Output is correct
13 Correct 6 ms 15572 KB Output is correct
14 Correct 6 ms 15572 KB Output is correct
15 Correct 7 ms 15572 KB Output is correct
16 Correct 7 ms 15508 KB Output is correct
17 Correct 6 ms 15572 KB Output is correct
18 Correct 7 ms 15524 KB Output is correct
19 Correct 7 ms 15572 KB Output is correct
20 Correct 7 ms 15572 KB Output is correct
21 Correct 7 ms 15572 KB Output is correct
22 Correct 47 ms 16156 KB Output is correct
23 Correct 42 ms 16176 KB Output is correct
24 Correct 44 ms 16084 KB Output is correct
25 Correct 51 ms 16204 KB Output is correct
26 Correct 44 ms 16160 KB Output is correct
27 Correct 44 ms 16172 KB Output is correct
28 Correct 44 ms 16176 KB Output is correct
29 Correct 45 ms 16172 KB Output is correct
30 Correct 43 ms 16152 KB Output is correct
31 Correct 44 ms 16160 KB Output is correct
32 Correct 47 ms 16268 KB Output is correct
33 Correct 44 ms 16352 KB Output is correct
34 Correct 11 ms 16084 KB Output is correct
35 Correct 10 ms 16112 KB Output is correct
36 Correct 36 ms 16192 KB Output is correct
37 Correct 28 ms 16180 KB Output is correct
38 Incorrect 36 ms 16260 KB Output isn't correct
39 Halted 0 ms 0 KB -