oj.uz

Submission #770068

# Submission time Handle Problem Language Result Execution time Memory
770068 2023-06-30T18:00:40 Z vjudge1 Klasika (COCI20_klasika) C++17
0 / 110
 5000 ms 231668 KB 
#include <bits/stdc++.h>

using namespace std;

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

const int lg = 31;

struct Trie {
  public:
  vector<vector<int>> trie;
  vector<int> values;
  map<int, bool> used;

  Trie() {
    trie.push_back(vector<int> (2, -1));
    values.push_back(0);
    used[0] = true;
  };

  void add(int x) {
    if (used[x]) {
      return ;
    }
    used[x] = true;
    values.push_back(x);
    int t = 0;
    for (int i = lg - 1; i >= 0; i--) {
      int bit = (x >> i) & 1;

      if (trie[t][bit] == -1) {
        trie[t][bit] = (int) trie.size();
        trie.emplace_back(2, -1);
      }
      t = trie[t][bit];
    }
  }

  int get(int x) {
    int t = 0;
    int ret = 0;

    for (int i = lg - 1; i >= 0; i--) {
      int bit = (x >> i) & 1;
      bit ^= 1;

      if (trie[t][bit] == -1) {
        bit ^= 1;
      } else {
        ret |= (1 << i);
      }

      if (trie[t][bit] == -1) {
        return 0;
      }
      t = trie[t][bit];
    }
    return ret;
  };
};

Trie Merge(Trie a, Trie b) {
  Trie c;

  if ((int) a.values.size() > (int) b.values.size()) {
    swap(a.values, b.values);
    swap(a.trie, b.trie);
  }
  c.values = b.values;
  c.trie = b.trie;

  for (int i = 0; i < (int) a.values.size(); i++) {
    c.add(a.values[i]);
  }
  return c;
}

class segTree {
  public:
  int n;
  vector<Trie> st;

  segTree(int _n) : n(_n) {
    st.resize(n * 4);
  }

  void update(int v, int l, int r, int pos, int nv) {
    if (l == r) {
      st[v].add(nv);
      return ;
    }

    int mid = l + (r - l) / 2;
    if (pos <= mid) {
      update(v * 2, l, mid, pos, nv);
    } else {
      update(v * 2 + 1, mid + 1, r, pos, nv);
    }
    st[v] = Merge(st[v * 2], st[v * 2 + 1]);
  }

  int get(int v, int l, int r, int low, int high, int p) {
    if (l == low && r == high) {
      return st[v].get(p);
    }

    int mid = l + (r - l) / 2;
    if (high <= mid) {
      return get(v * 2, l, mid, low, high, p);
    } else if (low > mid) {
      return get(v * 2 + 1, mid + 1, r, low, high, p);
    } else {
      return max(get(v * 2, l, mid, low, mid, p),
            get(v * 2 + 1, mid + 1, r, mid + 1, high, p));
    }
  }
};

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

  int q;
  cin >> q;

  int n = q + 1;

  vector<vector<int>> adj(n);
  vector<int> pref(n);

  auto Add = [&](int x, int y, int w) {
    adj[x].push_back(y);
    pref[y] = pref[x] ^ w;
  };

  int cnt = 1;

  vector<array<int, 3>> queries;

  for (int i = 0; i < q; i++) {
    string type;
    cin >> type;

    if (type == "Add") {
      int x, w;
      cin >> x >> w;
      --x;
      Add(x, cnt, w);
      queries.push_back({1, cnt, 0});
      ++cnt;

    } else {
      int a, b;
      cin >> a >> b;
      --a, --b;

      queries.push_back({2, a, b});
    }
  }

  vector<int> in(n);
  vector<int> out(n);
  vector<int> euler_tour;

  function<void(int)> Dfs = [&](int u) {
    in[u] = (int) euler_tour.size();
    euler_tour.push_back(u);

    for (auto v : adj[u]) {
      Dfs(v);
    }

    out[u] = (int) euler_tour.size() - 1;
  };

  Dfs(0);

  segTree st(n);

  st.update(1, 0, n - 1, in[0], 0);

  for (int i = 0; i < (int) queries.size(); i++) {
    int type = queries[i][0];
    
    if (type == 1) {
      int u = queries[i][1];

      st.update(1, 0, n - 1, in[u], pref[u]);
    } else {
      int a = queries[i][1];
      int b = queries[i][2];

      cout << st.get(1, 0, n - 1, in[b], out[b], pref[a]) << '\n';
    }
  }
  return 0;
}

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 1492 KB Output is correct
2 Incorrect 19 ms 1960 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 1492 KB Output is correct
2 Incorrect 19 ms 1960 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 33.0

# Verdict Execution time Memory Grader output
1 Execution timed out 5084 ms 231668 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 44.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 1492 KB Output is correct
2 Incorrect 19 ms 1960 KB Output isn't correct
3 Halted 0 ms 0 KB -