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답안 #786851

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
786851 2023-07-18T13:49:52 Z tch1cherin Cat Exercise (JOI23_ho_t4) C++17
51 / 100
 2000 ms 418276 KB 
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/hash_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

struct custom_hash {
  size_t operator()(uint64_t x) const {
    return (x + 228) * 239;
  }
};

const int MAX_N = 2e5 + 5;
const int MAX_L = __lg(MAX_N) + 1;
bitset<MAX_N> used_c, used_s;
gp_hash_table<int, int> pos[MAX_N];
vector<int> graph[MAX_N], parent[MAX_N], dist[MAX_N];
vector<char> deleted[MAX_N]; 
int ancestors[MAX_N][MAX_L], num[MAX_N] = {}, value[MAX_N], sz[MAX_N];

struct cmp {
  bool operator()(const int& x, const int& y) const {
    return value[x] < value[y];
  }
};

set<int, cmp> values[MAX_N];

void find_sizes(int u, int p) {
  sz[u] = 1;
  for (int v : graph[u]) {
    if (v != p && !used_c[v]) {
      find_sizes(v, u);
      sz[u] += sz[v];
    }
  }
}

int find_centroid(int u, int p, int n) {
  for (int v : graph[u]) {
    if (v != p && !used_c[v] && sz[v] > n / 2) {
      return find_centroid(v, u, n);
    }
  }
  return u;
}

void DFS(int u, int c, int p, int d) {
  pos[c][u] = (int)dist[c].size();
  dist[c].push_back(d);
  parent[c].push_back(p);
  deleted[c].push_back(false);
  values[c].insert(u);
  ancestors[u][num[u]++] = c;
  for (int v : graph[u]) {
    if (v != p && !used_c[v]) {
      DFS(v, c, u, d + 1);
    } 
  }
}

void centroid(int u) {
  find_sizes(u, -1);
  dist[u].reserve(sz[u]);
  parent[u].reserve(sz[u]);
  deleted[u].reserve(sz[u]);
  DFS(u, u, -1, 0);
  used_c[u] = true;
  for (int v : graph[u]) {
    if (!used_c[v]) {
      centroid(find_centroid(v, u, sz[v]));
    }
  }
}

void delete_subtree(int u, int p, int c) {
  values[c].erase(u);
  deleted[c][pos[c][u]] = true;
  for (int v : graph[u]) {
    if (v != p && pos[c].find(v) != pos[c].end() && !deleted[c][pos[c][v]]) {
      delete_subtree(v, u, c);
    }
  }
}

int64_t solve(int u) {
  used_s[u] = true;
  int64_t ans = 0;
  for (int i = 0; i < num[u]; i++) {
    int A = ancestors[u][i];
    if (!deleted[A][pos[A][u]]) {
      delete_subtree(u, parent[A][pos[A][u]], A); 
    }
  }
  for (int v : graph[u]) {
    if (!used_s[v]) {
      tuple<int, int, int> val = {-1, -1, -1};
      for (int i = 0; i < num[v]; i++) {
        int A = ancestors[v][i];
        if (!deleted[A][pos[A][v]] && !values[A].empty()) {
          int x = *values[A].rbegin();
          val = max(val, {value[x], -(dist[A][pos[A][x]] + dist[A][pos[A][v]]), x});
        }
      }
      ans = max(ans, solve(get<2>(val)) - get<1>(val) + 1);
    }
  }
  return ans;
}

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int N;
  cin >> N;
  for (int i = 0; i < N; i++) {
    cin >> value[i];
  }
  for (int i = 0; i < N - 1; i++) {
    int u, v;
    cin >> u >> v;
    u--, v--;
    graph[u].push_back(v);
    graph[v].push_back(u);
  }
  find_sizes(0, -1);
  centroid(find_centroid(0, -1, N));
  for (int i = 0; i < N; i++) {
    if (value[i] == N) {
      cout << solve(i) << "\n";
    }
  }
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 70744 KB Output is correct
2 Correct 43 ms 70756 KB Output is correct
3 Correct 44 ms 70708 KB Output is correct
4 Correct 43 ms 70704 KB Output is correct
5 Correct 43 ms 70740 KB Output is correct
6 Correct 45 ms 70732 KB Output is correct
7 Correct 43 ms 70704 KB Output is correct
8 Correct 42 ms 70740 KB Output is correct
9 Correct 43 ms 70792 KB Output is correct
10 Correct 42 ms 70700 KB Output is correct

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 70744 KB Output is correct
2 Correct 43 ms 70756 KB Output is correct
3 Correct 44 ms 70708 KB Output is correct
4 Correct 43 ms 70704 KB Output is correct
5 Correct 43 ms 70740 KB Output is correct
6 Correct 45 ms 70732 KB Output is correct
7 Correct 43 ms 70704 KB Output is correct
8 Correct 42 ms 70740 KB Output is correct
9 Correct 43 ms 70792 KB Output is correct
10 Correct 42 ms 70700 KB Output is correct
11 Correct 46 ms 71084 KB Output is correct
12 Correct 50 ms 71072 KB Output is correct
13 Correct 44 ms 71012 KB Output is correct
14 Correct 45 ms 71040 KB Output is correct
15 Correct 44 ms 70972 KB Output is correct
16 Correct 63 ms 70988 KB Output is correct
17 Correct 45 ms 71068 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 70744 KB Output is correct
2 Correct 43 ms 70756 KB Output is correct
3 Correct 44 ms 70708 KB Output is correct
4 Correct 43 ms 70704 KB Output is correct
5 Correct 43 ms 70740 KB Output is correct
6 Correct 45 ms 70732 KB Output is correct
7 Correct 43 ms 70704 KB Output is correct
8 Correct 42 ms 70740 KB Output is correct
9 Correct 43 ms 70792 KB Output is correct
10 Correct 42 ms 70700 KB Output is correct
11 Correct 46 ms 71084 KB Output is correct
12 Correct 50 ms 71072 KB Output is correct
13 Correct 44 ms 71012 KB Output is correct
14 Correct 45 ms 71040 KB Output is correct
15 Correct 44 ms 70972 KB Output is correct
16 Correct 63 ms 70988 KB Output is correct
17 Correct 45 ms 71068 KB Output is correct
18 Correct 72 ms 77592 KB Output is correct
19 Correct 61 ms 77484 KB Output is correct
20 Correct 63 ms 77464 KB Output is correct
21 Correct 62 ms 77144 KB Output is correct
22 Correct 67 ms 77196 KB Output is correct
23 Correct 69 ms 77220 KB Output is correct
24 Correct 75 ms 77184 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 70744 KB Output is correct
2 Correct 43 ms 70756 KB Output is correct
3 Correct 44 ms 70708 KB Output is correct
4 Correct 43 ms 70704 KB Output is correct
5 Correct 43 ms 70740 KB Output is correct
6 Correct 45 ms 70732 KB Output is correct
7 Correct 43 ms 70704 KB Output is correct
8 Correct 42 ms 70740 KB Output is correct
9 Correct 43 ms 70792 KB Output is correct
10 Correct 42 ms 70700 KB Output is correct
11 Correct 46 ms 71084 KB Output is correct
12 Correct 50 ms 71072 KB Output is correct
13 Correct 44 ms 71012 KB Output is correct
14 Correct 45 ms 71040 KB Output is correct
15 Correct 44 ms 70972 KB Output is correct
16 Correct 63 ms 70988 KB Output is correct
17 Correct 45 ms 71068 KB Output is correct
18 Correct 72 ms 77592 KB Output is correct
19 Correct 61 ms 77484 KB Output is correct
20 Correct 63 ms 77464 KB Output is correct
21 Correct 62 ms 77144 KB Output is correct
22 Correct 67 ms 77196 KB Output is correct
23 Correct 69 ms 77220 KB Output is correct
24 Correct 75 ms 77184 KB Output is correct
25 Correct 42 ms 70732 KB Output is correct
26 Correct 72 ms 77132 KB Output is correct
27 Correct 67 ms 77164 KB Output is correct
28 Correct 85 ms 77180 KB Output is correct
29 Correct 80 ms 77160 KB Output is correct
30 Correct 72 ms 75420 KB Output is correct
31 Correct 71 ms 75120 KB Output is correct
32 Correct 76 ms 75468 KB Output is correct
33 Correct 71 ms 75176 KB Output is correct

Subtask #5
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 70744 KB Output is correct
2 Correct 43 ms 70756 KB Output is correct
3 Correct 44 ms 70708 KB Output is correct
4 Correct 43 ms 70704 KB Output is correct
5 Correct 43 ms 70740 KB Output is correct
6 Correct 45 ms 70732 KB Output is correct
7 Correct 43 ms 70704 KB Output is correct
8 Correct 42 ms 70740 KB Output is correct
9 Correct 43 ms 70792 KB Output is correct
10 Correct 42 ms 70700 KB Output is correct
11 Correct 46 ms 71084 KB Output is correct
12 Correct 50 ms 71072 KB Output is correct
13 Correct 44 ms 71012 KB Output is correct
14 Correct 45 ms 71040 KB Output is correct
15 Correct 44 ms 70972 KB Output is correct
16 Correct 63 ms 70988 KB Output is correct
17 Correct 45 ms 71068 KB Output is correct
18 Correct 72 ms 77592 KB Output is correct
19 Correct 61 ms 77484 KB Output is correct
20 Correct 63 ms 77464 KB Output is correct
21 Correct 62 ms 77144 KB Output is correct
22 Correct 67 ms 77196 KB Output is correct
23 Correct 69 ms 77220 KB Output is correct
24 Correct 75 ms 77184 KB Output is correct
25 Correct 1517 ms 418276 KB Output is correct
26 Correct 1433 ms 415420 KB Output is correct
27 Correct 1408 ms 415408 KB Output is correct
28 Correct 1701 ms 402608 KB Output is correct
29 Correct 1620 ms 402544 KB Output is correct
30 Correct 1613 ms 402672 KB Output is correct
31 Correct 1591 ms 402596 KB Output is correct

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 70744 KB Output is correct
2 Correct 45 ms 70876 KB Output is correct
3 Execution timed out 2081 ms 277920 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #7
0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 70744 KB Output is correct
2 Correct 43 ms 70756 KB Output is correct
3 Correct 44 ms 70708 KB Output is correct
4 Correct 43 ms 70704 KB Output is correct
5 Correct 43 ms 70740 KB Output is correct
6 Correct 45 ms 70732 KB Output is correct
7 Correct 43 ms 70704 KB Output is correct
8 Correct 42 ms 70740 KB Output is correct
9 Correct 43 ms 70792 KB Output is correct
10 Correct 42 ms 70700 KB Output is correct
11 Correct 46 ms 71084 KB Output is correct
12 Correct 50 ms 71072 KB Output is correct
13 Correct 44 ms 71012 KB Output is correct
14 Correct 45 ms 71040 KB Output is correct
15 Correct 44 ms 70972 KB Output is correct
16 Correct 63 ms 70988 KB Output is correct
17 Correct 45 ms 71068 KB Output is correct
18 Correct 72 ms 77592 KB Output is correct
19 Correct 61 ms 77484 KB Output is correct
20 Correct 63 ms 77464 KB Output is correct
21 Correct 62 ms 77144 KB Output is correct
22 Correct 67 ms 77196 KB Output is correct
23 Correct 69 ms 77220 KB Output is correct
24 Correct 75 ms 77184 KB Output is correct
25 Correct 42 ms 70732 KB Output is correct
26 Correct 72 ms 77132 KB Output is correct
27 Correct 67 ms 77164 KB Output is correct
28 Correct 85 ms 77180 KB Output is correct
29 Correct 80 ms 77160 KB Output is correct
30 Correct 72 ms 75420 KB Output is correct
31 Correct 71 ms 75120 KB Output is correct
32 Correct 76 ms 75468 KB Output is correct
33 Correct 71 ms 75176 KB Output is correct
34 Correct 1517 ms 418276 KB Output is correct
35 Correct 1433 ms 415420 KB Output is correct
36 Correct 1408 ms 415408 KB Output is correct
37 Correct 1701 ms 402608 KB Output is correct
38 Correct 1620 ms 402544 KB Output is correct
39 Correct 1613 ms 402672 KB Output is correct
40 Correct 1591 ms 402596 KB Output is correct
41 Correct 42 ms 70744 KB Output is correct
42 Correct 45 ms 70876 KB Output is correct
43 Execution timed out 2081 ms 277920 KB Time limit exceeded
44 Halted 0 ms 0 KB -