oj.uz

답안 #770024

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
770024 2023-06-30T16:52:18 Z vjudge1 Paths (RMI21_paths) C++17
48 / 100
 600 ms 18756 KB 
#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "C:\GCC\debug.h"
#else
#define debug(...) void(42)
#endif

template <typename T, class F = function<T(const T&, const T&)>>
class SparseTable {
 public:
  int n;
  vector<vector<T>> mat;
  F func;

  SparseTable(const vector<T>& a, const F& f) : func(f) {
    n = static_cast<int>(a.size());
    int max_log = 32 - __builtin_clz(n);
    mat.resize(max_log);
    mat[0] = a;
    for (int j = 1; j < max_log; j++) {
      mat[j].resize(n - (1 << j) + 1);
      for (int i = 0; i <= n - (1 << j); i++) {
        mat[j][i] = func(mat[j - 1][i], mat[j - 1][i + (1 << (j - 1))]);
      }
    }
  }

  T get(int from, int to) const {
    assert(0 <= from && from <= to && to <= n - 1);
    int lg = 32 - __builtin_clz(to - from + 1) - 1;
    return func(mat[lg][from], mat[lg][to - (1 << lg) + 1]);
  }
};

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  int n, k;
  cin >> n >> k;

  if (k == 1) {
    vector<vector<array<long long, 2>>> adj(n);

    for (int i = 0; i < n - 1; i++) {
      int u, v, c;
      cin >> u >> v >> c;
      --u, --v;
      adj[u].push_back({v, c});
      adj[v].push_back({u, c});
    }

    vector<vector<long long>> d(n, vector<long long> (2));
    vector<long long> res(n);

    function<void(int, int)> Dfs = [&](int u, int prev) {
      for (auto v : adj[u]) {
        if (v[0] == prev) {
          continue;
        }
        Dfs(v[0], u);
        if (d[v[0]][0] + v[1] > d[u][0]) {
          d[u][1] = d[u][0];
          d[u][0] = d[v[0]][0] + v[1];
        } else if (d[v[0]][0] + v[1] > d[u][1]) {
          d[u][1] = d[v[0]][0] + v[1];
        }
      }
    };

    Dfs(0, -1);

    function<void(int, int, long long)> Dfs2 = [&](int u, int prev, long long c) {
      res[u] = max(c, d[u][0]);

      for (auto v : adj[u]) {
        if (v[0] == prev) {
          continue;
        }
        if (d[v[0]][0] + v[1] == d[u][0]) {
          Dfs2(v[0], u, max(c, d[u][1]) + v[1]);
        } else {
          Dfs2(v[0], u, res[u] + v[1]);
        }
      }
    };

    Dfs2(0, -1, 0);

    for (int root = 0; root < n; root++) {
      cout << res[root] << '\n';  
    }
    return 0;
  }

  vector<vector<array<long long, 2>>> adj(n);

  for (int i = 0; i < n - 1; i++) {
    int u, v, c;
    cin >> u >> v >> c;
    --u, --v;
    adj[u].push_back({v, c});
    adj[v].push_back({u, c});
  }

  vector<long long> to(n);
  vector<int> depth(n);
  vector<int> in(n);
  vector<int> leaves;
  vector<int> euler_tour;

  function<void(int, int, long long)> Dfs = [&](int u, int prev, long long sumAlongPath) {
    to[u] = sumAlongPath;
    bool is_leaf = true;

    in[u] = (int) euler_tour.size();
    euler_tour.push_back(u);

    for (auto v : adj[u]) {
      if (v[0] == prev) {
        continue;
      }
      is_leaf = false;
      depth[v[0]] = depth[u] + 1;
      Dfs(v[0], u, sumAlongPath + v[1]);
      euler_tour.push_back(u);
    }

    if (is_leaf) {
      leaves.push_back(u);
    }
  };

  auto Clear = [&]() {
    to.clear();
    to.resize(n);
    depth.clear();
    depth.resize(n);
    in.clear();
    in.resize(n);
    leaves.clear();
    euler_tour.clear();
  };

  for (int root = 0; root < n; root++) {
    Clear();
    Dfs(root, -1, 0LL);

    SparseTable<int> st(euler_tour, [&](int x, int y) {
      if (depth[x] < depth[y]) {
        return x;
      }
      return y;
    });

    auto lca = [&](int x, int y) {
      if (in[x] > in[y]) {
        swap(x, y);
      }
      return st.get(in[x], in[y]);
    };

    vector<int> current_lca(n, root);

    long long res = 0;

    int len = (int) leaves.size();

    for (int j = 0; j < min(len, k); j++) {
      long long best = 0;
      int toUse = -1;
      for (int i = 0; i < (int) leaves.size(); i++) {
        if (best < to[leaves[i]]) {
          best = to[leaves[i]];
          toUse = leaves[i];
        }
      }
      if (toUse == -1) {
        break;
      }
      res += best;

      vector<int> nleaves;
      for (int i = 0; i < (int) leaves.size(); i++) {
        if (leaves[i] == toUse) {
          continue;
        }
        nleaves.push_back(leaves[i]);
        int nlca = lca(toUse, leaves[i]);
        if (depth[nlca] > depth[current_lca[leaves[i]]]) {
          to[leaves[i]] += to[current_lca[leaves[i]]];
          to[leaves[i]] -= to[nlca];
          current_lca[leaves[i]] = nlca;
        }
      }

      swap(leaves, nleaves);
    }

    cout << res << '\n';
  }
  return 0;
}

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 7 ms 340 KB Output is correct
4 Correct 6 ms 320 KB Output is correct
5 Correct 8 ms 340 KB Output is correct
6 Correct 4 ms 340 KB Output is correct
7 Correct 6 ms 340 KB Output is correct

Subtask #3
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 7 ms 340 KB Output is correct
4 Correct 6 ms 320 KB Output is correct
5 Correct 8 ms 340 KB Output is correct
6 Correct 4 ms 340 KB Output is correct
7 Correct 6 ms 340 KB Output is correct
8 Correct 555 ms 516 KB Output is correct
9 Correct 206 ms 576 KB Output is correct
10 Correct 141 ms 548 KB Output is correct
11 Correct 573 ms 644 KB Output is correct
12 Correct 202 ms 640 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 7 ms 340 KB Output is correct
4 Correct 6 ms 320 KB Output is correct
5 Correct 8 ms 340 KB Output is correct
6 Correct 4 ms 340 KB Output is correct
7 Correct 6 ms 340 KB Output is correct
8 Correct 555 ms 516 KB Output is correct
9 Correct 206 ms 576 KB Output is correct
10 Correct 141 ms 548 KB Output is correct
11 Correct 573 ms 644 KB Output is correct
12 Correct 202 ms 640 KB Output is correct
13 Execution timed out 1083 ms 832 KB Time limit exceeded
14 Halted 0 ms 0 KB -

Subtask #5
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 79 ms 15856 KB Output is correct
2 Correct 68 ms 18756 KB Output is correct
3 Correct 55 ms 15948 KB Output is correct
4 Correct 62 ms 15848 KB Output is correct
5 Correct 66 ms 17132 KB Output is correct
6 Correct 73 ms 15852 KB Output is correct

Subtask #6
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 7 ms 340 KB Output is correct
4 Correct 6 ms 320 KB Output is correct
5 Correct 8 ms 340 KB Output is correct
6 Correct 4 ms 340 KB Output is correct
7 Correct 6 ms 340 KB Output is correct
8 Correct 555 ms 516 KB Output is correct
9 Correct 206 ms 576 KB Output is correct
10 Correct 141 ms 548 KB Output is correct
11 Correct 573 ms 644 KB Output is correct
12 Correct 202 ms 640 KB Output is correct
13 Execution timed out 1083 ms 832 KB Time limit exceeded
14 Halted 0 ms 0 KB -