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Submission #670525

# Submission time Handle Problem Language Result Execution time Memory
670525 2022-12-09T13:30:47 Z MilosMilutinovic Meetings 2 (JOI21_meetings2) C++14
100 / 100
 624 ms 63900 KB 
#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<vector<int>> g(n);
  for (int i = 1; i < n; i++) {
    int u, v;
    cin >> u >> v;
    --u; --v;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  vector<int> sz(n);
  function<void(int, int)> DfsSz = [&](int v, int pv) {
    sz[v] = 1;
    for (int u : g[v]) {
      if (u == pv) {
        continue;
      }
      DfsSz(u, v);
      sz[v] += sz[u];
    }
  };
  DfsSz(0, 0);
  function<int(int, int)> Find = [&](int v, int pv) {
    for (int u : g[v]) {
      if (u == pv) {
        continue;
      }
      if (sz[u] * 2 >= n) {
        return Find(u, v);
      }
    }
    return v;
  };
  int c = Find(0, 0);
  const int L = 25;
  vector<vector<int>> jump(n, vector<int>(L));
  vector<int> dep(n);
  vector<int> dfn(n);
  vector<int> dfo(n);
  int T = 0;
  function<void(int, int)> Dfs = [&](int v, int pv) {
    dfn[v] = ++T;
    sz[v] = 1;
    jump[v][0] = pv;
    for (int u : g[v]) {
      if (u == pv) {
        continue;
      }
      dep[u] = dep[v] + 1;
      Dfs(u, v);
      sz[v] += sz[u];
    }
    dfo[v] = T;
  };
  Dfs(c, c);
  for (int j = 1; j < L; j++) {
    for (int i = 0; i < n; i++) {
      jump[i][j] = jump[jump[i][j - 1]][j - 1];
    }
  }
  auto LCA = [&](int x, int y) {
    if (dep[x] < dep[y]) {
      swap(x, y);
    }
    for (int i = L - 1; i >= 0; i--) {
      if (dep[jump[x][i]] >= dep[y]) {
        x = jump[x][i];
      }
    }
    if (x == y) {
      return x;
    }
    for (int i = L - 1; i >= 0; i--) {
      if (jump[x][i] != jump[y][i]) {
        x = jump[x][i];
        y = jump[y][i];
      }
    }
    return jump[x][0];
  };
  auto GetDist = [&](int x, int y) {
    return dep[x] + dep[y] - 2 * dep[LCA(x, y)];
  };
  vector<vector<int>> ver(n + 1);
  for (int i = 0; i < n; i++) {
    ver[sz[i]].push_back(i);
  }
  int x = c;
  int y = c;
  int d = 0;
  vector<int> ans(n + 1);
  for (int i = n / 2; i >= 1; i--) {
    for (int z : ver[i]) {
      int d_xz = GetDist(x, z);
      int d_yz = GetDist(y, z);
      if (d_xz < d_yz) {
        swap(x, y);
        swap(d_xz, d_yz);
      }
      if (d_xz > d) {
        d = d_xz;
        y = z;
      }
    }
    ans[2 * i] = d;
  }
  for (int i = 1; i <= n; i++) {
    cout << ans[i] + 1 << '\n';
  }
  return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 328 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 316 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 320 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 320 KB Output is correct
15 Correct 1 ms 320 KB Output is correct
16 Correct 1 ms 316 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 316 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 328 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 316 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 320 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 320 KB Output is correct
15 Correct 1 ms 320 KB Output is correct
16 Correct 1 ms 316 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 316 KB Output is correct
22 Correct 5 ms 1236 KB Output is correct
23 Correct 5 ms 1236 KB Output is correct
24 Correct 5 ms 1236 KB Output is correct
25 Correct 5 ms 1232 KB Output is correct
26 Correct 5 ms 1228 KB Output is correct
27 Correct 5 ms 1236 KB Output is correct
28 Correct 5 ms 1236 KB Output is correct
29 Correct 5 ms 1236 KB Output is correct
30 Correct 5 ms 1236 KB Output is correct
31 Correct 5 ms 1232 KB Output is correct
32 Correct 5 ms 1504 KB Output is correct
33 Correct 5 ms 1584 KB Output is correct
34 Correct 4 ms 1236 KB Output is correct
35 Correct 4 ms 1236 KB Output is correct
36 Correct 5 ms 1236 KB Output is correct
37 Correct 4 ms 1236 KB Output is correct
38 Correct 5 ms 1364 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 328 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 316 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 320 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 320 KB Output is correct
15 Correct 1 ms 320 KB Output is correct
16 Correct 1 ms 316 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 316 KB Output is correct
22 Correct 5 ms 1236 KB Output is correct
23 Correct 5 ms 1236 KB Output is correct
24 Correct 5 ms 1236 KB Output is correct
25 Correct 5 ms 1232 KB Output is correct
26 Correct 5 ms 1228 KB Output is correct
27 Correct 5 ms 1236 KB Output is correct
28 Correct 5 ms 1236 KB Output is correct
29 Correct 5 ms 1236 KB Output is correct
30 Correct 5 ms 1236 KB Output is correct
31 Correct 5 ms 1232 KB Output is correct
32 Correct 5 ms 1504 KB Output is correct
33 Correct 5 ms 1584 KB Output is correct
34 Correct 4 ms 1236 KB Output is correct
35 Correct 4 ms 1236 KB Output is correct
36 Correct 5 ms 1236 KB Output is correct
37 Correct 4 ms 1236 KB Output is correct
38 Correct 5 ms 1364 KB Output is correct
39 Correct 351 ms 49628 KB Output is correct
40 Correct 355 ms 48456 KB Output is correct
41 Correct 346 ms 49936 KB Output is correct
42 Correct 342 ms 50648 KB Output is correct
43 Correct 358 ms 50628 KB Output is correct
44 Correct 363 ms 50756 KB Output is correct
45 Correct 624 ms 58268 KB Output is correct
46 Correct 457 ms 63900 KB Output is correct
47 Correct 296 ms 51136 KB Output is correct
48 Correct 265 ms 51040 KB Output is correct
49 Correct 439 ms 51420 KB Output is correct
50 Correct 262 ms 51124 KB Output is correct
51 Correct 374 ms 61036 KB Output is correct