oj.uz

답안 #805564

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
805564 2023-08-03T17:53:27 Z vjudge1 Meetings 2 (JOI21_meetings2) C++17
20 / 100
 4000 ms 46416 KB 
#include<bits/stdc++.h>

using namespace std;
using ll = long long;

const int B = 1000;
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) {
    if(s == p) T = 0, depth[s] = 0;
    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);
    DFS(root, root);

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

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 15572 KB Output is correct
2 Correct 9 ms 15572 KB Output is correct
3 Correct 7 ms 15572 KB Output is correct
4 Correct 10 ms 15572 KB Output is correct
5 Correct 7 ms 15572 KB Output is correct
6 Correct 7 ms 15540 KB Output is correct
7 Correct 7 ms 15572 KB Output is correct
8 Correct 9 ms 15552 KB Output is correct
9 Correct 9 ms 15528 KB Output is correct
10 Correct 8 ms 15572 KB Output is correct
11 Correct 7 ms 15572 KB Output is correct
12 Correct 7 ms 15572 KB Output is correct
13 Correct 7 ms 15572 KB Output is correct
14 Correct 7 ms 15572 KB Output is correct
15 Correct 8 ms 15572 KB Output is correct
16 Correct 7 ms 15572 KB Output is correct
17 Correct 8 ms 15572 KB Output is correct
18 Correct 9 ms 15572 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
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 15572 KB Output is correct
2 Correct 9 ms 15572 KB Output is correct
3 Correct 7 ms 15572 KB Output is correct
4 Correct 10 ms 15572 KB Output is correct
5 Correct 7 ms 15572 KB Output is correct
6 Correct 7 ms 15540 KB Output is correct
7 Correct 7 ms 15572 KB Output is correct
8 Correct 9 ms 15552 KB Output is correct
9 Correct 9 ms 15528 KB Output is correct
10 Correct 8 ms 15572 KB Output is correct
11 Correct 7 ms 15572 KB Output is correct
12 Correct 7 ms 15572 KB Output is correct
13 Correct 7 ms 15572 KB Output is correct
14 Correct 7 ms 15572 KB Output is correct
15 Correct 8 ms 15572 KB Output is correct
16 Correct 7 ms 15572 KB Output is correct
17 Correct 8 ms 15572 KB Output is correct
18 Correct 9 ms 15572 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 53 ms 16164 KB Output is correct
23 Correct 65 ms 16188 KB Output is correct
24 Correct 52 ms 16188 KB Output is correct
25 Correct 56 ms 16260 KB Output is correct
26 Correct 54 ms 16180 KB Output is correct
27 Correct 60 ms 16084 KB Output is correct
28 Correct 55 ms 16232 KB Output is correct
29 Correct 56 ms 16188 KB Output is correct
30 Correct 67 ms 16124 KB Output is correct
31 Correct 55 ms 16084 KB Output is correct
32 Correct 54 ms 16304 KB Output is correct
33 Correct 53 ms 16340 KB Output is correct
34 Correct 9 ms 16084 KB Output is correct
35 Correct 9 ms 16084 KB Output is correct
36 Correct 42 ms 16212 KB Output is correct
37 Correct 32 ms 16212 KB Output is correct
38 Correct 41 ms 16228 KB Output is correct

Subtask #3
0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 15572 KB Output is correct
2 Correct 9 ms 15572 KB Output is correct
3 Correct 7 ms 15572 KB Output is correct
4 Correct 10 ms 15572 KB Output is correct
5 Correct 7 ms 15572 KB Output is correct
6 Correct 7 ms 15540 KB Output is correct
7 Correct 7 ms 15572 KB Output is correct
8 Correct 9 ms 15552 KB Output is correct
9 Correct 9 ms 15528 KB Output is correct
10 Correct 8 ms 15572 KB Output is correct
11 Correct 7 ms 15572 KB Output is correct
12 Correct 7 ms 15572 KB Output is correct
13 Correct 7 ms 15572 KB Output is correct
14 Correct 7 ms 15572 KB Output is correct
15 Correct 8 ms 15572 KB Output is correct
16 Correct 7 ms 15572 KB Output is correct
17 Correct 8 ms 15572 KB Output is correct
18 Correct 9 ms 15572 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 53 ms 16164 KB Output is correct
23 Correct 65 ms 16188 KB Output is correct
24 Correct 52 ms 16188 KB Output is correct
25 Correct 56 ms 16260 KB Output is correct
26 Correct 54 ms 16180 KB Output is correct
27 Correct 60 ms 16084 KB Output is correct
28 Correct 55 ms 16232 KB Output is correct
29 Correct 56 ms 16188 KB Output is correct
30 Correct 67 ms 16124 KB Output is correct
31 Correct 55 ms 16084 KB Output is correct
32 Correct 54 ms 16304 KB Output is correct
33 Correct 53 ms 16340 KB Output is correct
34 Correct 9 ms 16084 KB Output is correct
35 Correct 9 ms 16084 KB Output is correct
36 Correct 42 ms 16212 KB Output is correct
37 Correct 32 ms 16212 KB Output is correct
38 Correct 41 ms 16228 KB Output is correct
39 Execution timed out 4099 ms 46416 KB Time limit exceeded
40 Halted 0 ms 0 KB -