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답안 #804299

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
804299 2023-08-03T07:52:58 Z vjudge1 Meetings 2 (JOI21_meetings2) C++17
20 / 100
 4000 ms 36944 KB 
#include<bits/stdc++.h>

using namespace std;
using ll = long long;

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

    for(int to : g[s]) {
        if(to == p) continue;
        int x = dfs(to, s);
        if(x >= mx0) mx1 = mx0, mx0 = x;
        else if(x > mx1) mx1 = x;
        f = max(f, x + 1);
    }
    res = max(res, 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]);
}
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);
    }
    precalc(1, 1);
    if(n == 1) {
        cout << 1;
        return 0;
    }
    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;
        }
    }
    // cout << x0 << ' ' << x1 << '\n'; 
    vector<int> rs(n + 1, 1);
    int k = 2 * 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 <= k; i++) {
        if(i % 2) continue;
        res = 0, curK = i / 2;
        dfs(root, root);
        rs[i] = res;
    }
    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 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 3 ms 7380 KB Output is correct
4 Correct 3 ms 7380 KB Output is correct
5 Correct 3 ms 7380 KB Output is correct
6 Correct 3 ms 7380 KB Output is correct
7 Correct 3 ms 7380 KB Output is correct
8 Correct 3 ms 7324 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 3 ms 7388 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 4 ms 7384 KB Output is correct
14 Correct 3 ms 7380 KB Output is correct
15 Correct 4 ms 7380 KB Output is correct
16 Correct 3 ms 7376 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7388 KB Output is correct
19 Correct 3 ms 7380 KB Output is correct
20 Correct 4 ms 7380 KB Output is correct
21 Correct 4 ms 7380 KB Output is correct

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 3 ms 7380 KB Output is correct
4 Correct 3 ms 7380 KB Output is correct
5 Correct 3 ms 7380 KB Output is correct
6 Correct 3 ms 7380 KB Output is correct
7 Correct 3 ms 7380 KB Output is correct
8 Correct 3 ms 7324 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 3 ms 7388 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 4 ms 7384 KB Output is correct
14 Correct 3 ms 7380 KB Output is correct
15 Correct 4 ms 7380 KB Output is correct
16 Correct 3 ms 7376 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7388 KB Output is correct
19 Correct 3 ms 7380 KB Output is correct
20 Correct 4 ms 7380 KB Output is correct
21 Correct 4 ms 7380 KB Output is correct
22 Correct 84 ms 8088 KB Output is correct
23 Correct 69 ms 7972 KB Output is correct
24 Correct 71 ms 7980 KB Output is correct
25 Correct 78 ms 7904 KB Output is correct
26 Correct 69 ms 7972 KB Output is correct
27 Correct 42 ms 7996 KB Output is correct
28 Correct 93 ms 8028 KB Output is correct
29 Correct 58 ms 7980 KB Output is correct
30 Correct 82 ms 7992 KB Output is correct
31 Correct 51 ms 7980 KB Output is correct
32 Correct 86 ms 8092 KB Output is correct
33 Correct 96 ms 8176 KB Output is correct
34 Correct 6 ms 7892 KB Output is correct
35 Correct 5 ms 7904 KB Output is correct
36 Correct 68 ms 8012 KB Output is correct
37 Correct 45 ms 8000 KB Output is correct
38 Correct 68 ms 8068 KB Output is correct

Subtask #3
0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 3 ms 7380 KB Output is correct
4 Correct 3 ms 7380 KB Output is correct
5 Correct 3 ms 7380 KB Output is correct
6 Correct 3 ms 7380 KB Output is correct
7 Correct 3 ms 7380 KB Output is correct
8 Correct 3 ms 7324 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 3 ms 7388 KB Output is correct
12 Correct 4 ms 7380 KB Output is correct
13 Correct 4 ms 7384 KB Output is correct
14 Correct 3 ms 7380 KB Output is correct
15 Correct 4 ms 7380 KB Output is correct
16 Correct 3 ms 7376 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 4 ms 7388 KB Output is correct
19 Correct 3 ms 7380 KB Output is correct
20 Correct 4 ms 7380 KB Output is correct
21 Correct 4 ms 7380 KB Output is correct
22 Correct 84 ms 8088 KB Output is correct
23 Correct 69 ms 7972 KB Output is correct
24 Correct 71 ms 7980 KB Output is correct
25 Correct 78 ms 7904 KB Output is correct
26 Correct 69 ms 7972 KB Output is correct
27 Correct 42 ms 7996 KB Output is correct
28 Correct 93 ms 8028 KB Output is correct
29 Correct 58 ms 7980 KB Output is correct
30 Correct 82 ms 7992 KB Output is correct
31 Correct 51 ms 7980 KB Output is correct
32 Correct 86 ms 8092 KB Output is correct
33 Correct 96 ms 8176 KB Output is correct
34 Correct 6 ms 7892 KB Output is correct
35 Correct 5 ms 7904 KB Output is correct
36 Correct 68 ms 8012 KB Output is correct
37 Correct 45 ms 8000 KB Output is correct
38 Correct 68 ms 8068 KB Output is correct
39 Execution timed out 4059 ms 36944 KB Time limit exceeded
40 Halted 0 ms 0 KB -