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답안 #398839

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
398839 2021-05-04T21:13:58 Z 12tqian Meetings 2 (JOI21_meetings2) C++17
100 / 100
 726 ms 61132 KB 
#include <bits/stdc++.h>

using namespace std;

#define f1r(i, a, b) for (int i = a; i < b; ++i)
#define f0r(i, a) f1r(i, 0, a)
#define each(t, a) for (auto& t : a)

#define mp make_pair
#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;

template <class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template <class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

struct LCAJump {
    int n;
    std::vector<std::vector<int>> par;
    std::vector<std::vector<int>> adj;
    std::vector<int> depth;

    void init(int _n) {
        n = _n;
        int d = 1;
        while ((1 << d) < n) d++;
        par.assign(d, std::vector<int>(n));
        adj.resize(n);
        depth.resize(n);
    }

    void ae(int x, int y) {
        adj[x].push_back(y);
        adj[y].push_back(x);
    }

    void gen(int root = 0) {
        par[0][root] = root;
        dfs(root);
    }

    void dfs(int src = 0) {
        for (int i = 1; i < (int)par.size(); i++) {
            par[i][src] = par[i - 1][par[i - 1][src]];
        }
        for (int nxt: adj[src]) {
            if (nxt == par[0][src]) continue;
            depth[nxt] = depth[par[0][nxt] = src] + 1;
            dfs(nxt);
        }
    }

    int jump(int x, int d) {
        for (int i = 0; i < (int)par.size(); i++) {
            if ((d >> i) & 1) {
                x = par[i][x];
            }
        }
        return x;
    }
    
    int lca(int x, int y) {
        if (depth[x] < depth[y]) std::swap(x, y);
        x = jump(x, depth[x] - depth[y]);
        if (x == y) return x;
        for (int i = (int)par.size() - 1; i >= 0; i--) {
            int nx = par[i][x];
            int ny = par[i][y];
            if (nx != ny) x = nx, y = ny;
        }
        return par[0][x];
    }

    int dist(int x, int y) {
        return depth[x] + depth[y] - 2 * depth[lca(x, y)];
    }
};

LCAJump L;

struct DynamicDiameter {
    pi ed;
    void init(int x) {
        ed = {x, x};
    }
    void add(int x) {
        int d1 = L.dist(ed.f, x);
        int d2 = L.dist(ed.s, x);
        int d3 = L.dist(ed.f, ed.s);
        if (d3 >= max(d1, d2)) return;
        if (d1 >= d2) ed.s = x;
        else ed.f = x;
    }
    int get() {
        return L.dist(ed.f, ed.s);
    }
};

int main() {
    cin.tie(0)->sync_with_stdio(0); 
    int n; cin >> n;
    L.init(n);
    vector<vi> g(n);
    vi size(n);
    vi par(n);
    f0r(i, n - 1) {
        int u, v; cin >> u >> v;
        --u, --v;
        g[u].pb(v);
        g[v].pb(u);
        L.ae(u, v);
    }
    function<void(int, int)> dfs_size = [&](int u, int p) {
        size[u] = 1;
        par[u] = p;
        each(v, g[u]) {
            if (v == p) continue;
            dfs_size(v, u);
            size[u] += size[v];
        }
    };
    auto get_centroid = [&](int u) -> int {
        dfs_size(u, -1);
        int p = -1;
        do {
            int go = -1;
            each(v, g[u]) {
                if (v == p) continue;
                if (2 * size[v] > n) go = v;
            } 
            p = u;
            u = go;
        } while (u != -1);
        return p;
    };
    int c = get_centroid(0);
    L.gen(c);
    dfs_size(c, -1);
    vi ans(n + 1, 1);
    vector<vi> on(n + 1); // when things get turned on
    f0r(i, n) {
        if (i == c) continue;
        on[size[i]].pb(i);
    }
    DynamicDiameter D;
    D.init(c);
    for (int i = n / 2; i >= 1; i--) {
        each(u, on[i]) {
            D.add(u);
        }
        ans[2 * i] = D.get() + 1;
    }
    f1r(i, 1, n + 1) cout << ans[i] << '\n';


    return 0;
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 320 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 316 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 320 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 208 KB Output is correct

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 320 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 316 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 320 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 208 KB Output is correct
22 Correct 5 ms 1100 KB Output is correct
23 Correct 5 ms 1100 KB Output is correct
24 Correct 4 ms 1100 KB Output is correct
25 Correct 5 ms 1100 KB Output is correct
26 Correct 4 ms 1100 KB Output is correct
27 Correct 4 ms 1100 KB Output is correct
28 Correct 5 ms 1100 KB Output is correct
29 Correct 5 ms 1100 KB Output is correct
30 Correct 5 ms 1100 KB Output is correct
31 Correct 4 ms 1100 KB Output is correct
32 Correct 5 ms 1364 KB Output is correct
33 Correct 6 ms 1356 KB Output is correct
34 Correct 4 ms 1100 KB Output is correct
35 Correct 4 ms 1100 KB Output is correct
36 Correct 5 ms 1152 KB Output is correct
37 Correct 4 ms 1100 KB Output is correct
38 Correct 5 ms 1228 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 320 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 316 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 320 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 208 KB Output is correct
22 Correct 5 ms 1100 KB Output is correct
23 Correct 5 ms 1100 KB Output is correct
24 Correct 4 ms 1100 KB Output is correct
25 Correct 5 ms 1100 KB Output is correct
26 Correct 4 ms 1100 KB Output is correct
27 Correct 4 ms 1100 KB Output is correct
28 Correct 5 ms 1100 KB Output is correct
29 Correct 5 ms 1100 KB Output is correct
30 Correct 5 ms 1100 KB Output is correct
31 Correct 4 ms 1100 KB Output is correct
32 Correct 5 ms 1364 KB Output is correct
33 Correct 6 ms 1356 KB Output is correct
34 Correct 4 ms 1100 KB Output is correct
35 Correct 4 ms 1100 KB Output is correct
36 Correct 5 ms 1152 KB Output is correct
37 Correct 4 ms 1100 KB Output is correct
38 Correct 5 ms 1228 KB Output is correct
39 Correct 616 ms 47920 KB Output is correct
40 Correct 460 ms 46716 KB Output is correct
41 Correct 496 ms 47964 KB Output is correct
42 Correct 455 ms 48840 KB Output is correct
43 Correct 469 ms 48728 KB Output is correct
44 Correct 475 ms 48796 KB Output is correct
45 Correct 726 ms 55968 KB Output is correct
46 Correct 526 ms 61132 KB Output is correct
47 Correct 407 ms 49804 KB Output is correct
48 Correct 294 ms 50476 KB Output is correct
49 Correct 563 ms 49620 KB Output is correct
50 Correct 329 ms 50480 KB Output is correct
51 Correct 407 ms 59208 KB Output is correct