Submission #1086992

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086992		vjudge1	Klasika (COCI20_klasika)	C++14	0 / 110	256 ms	167548 KiB

klasika

#include<bits/stdc++.h>
using namespace std;

#define NAME ""
#define ll long long
#define pii pair < int , int >
#define fi first
#define se second
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i ++)
#define FORD(i, a, b) for (int i = (a), _b = (b); i >= _b; i --)
#define REP(i, n) for (int i = 0, _n = (n); i < _n; i ++)
#define bit(x, i) (((x) >> (i)) & 1ll)
#define mask(x) (1ll << (x))
#define mem(f, x) memset(f, x, sizeof(f))
#define sz(x) (int32_t) (x.size())

const int nmax = 2e5;
int in[nmax + 5], out[nmax + 5], timer = 0, a[nmax + 5];
bool type[nmax + 5];
pii query[nmax + 5];
vector < int > adj[nmax + 5];

void dfs(int i) {
  in[i] = ++ timer;

  for (auto x: adj[i]) {
    dfs(x);
  }

  out[i] = timer;
}

struct SegTree {
  struct Trie {
    struct Node{
      int child[2];

      Node() {
        child[0] = child[1] = -1;
      }
    };

    int m = -1;
    vector < Node > a;

    void create() {
      ++ m;
      a.push_back(Node());
    }

    Trie() {
      create();
    }

    void add(int x) {
      int pos = 0;
      FORD(i, 30, 0) {
        int c = bit(x, i);

        if (a[pos].child[c] == -1) {
          create();
          a[pos].child[c] = m;
        }

        pos = a[pos].child[c];
      }
    }

    int query(int x) {
      int res = 0, pos = 0;

      FORD(i, 30, 0) {
        int c = bit(x, i);

        if (a[pos].child[1 - c] != -1) {
          res ^= mask(i);
          pos = a[pos].child[1 - c];
        }
        else {
          pos = a[pos].child[c];
        }
      }
      return res;
    }
  };

  int n;
  vector < Trie > b;

  void init(int _n) {
    n = _n;
    b.assign(n * 4 + 1, Trie());
  }

  void update(int id, int l, int r, int i, int val) {
    b[id].add(val);

    if (l == r) {
      return;
    }

    int mid = (l + r) >> 1;

    if (mid >= i) {
      update(id << 1, l, mid, i, val);
    }
    else {
      update(id << 1 | 1, mid + 1, r, i, val);
    }
  }
  int get(int id, int l, int r, int u, int v, int val) {
    if (l > v || u > r) {
      return 0;
    }

    if (u <= l && r <= v) {
      return b[id].query(val);
    }

    int mid = (l + r) / 2;

    return max(get(id << 1, l, mid, u, v, val), get(id << 1 | 1, mid + 1, r, u, v, val));
  }

  void update(int i, int val) {
    update(1, 1, n, i, val);
  }

  int get(int l, int r, int val) {
    return get(1, 1, n, l, r, val);
  }
}seg;

signed main() {
  if (fopen(NAME".inp", "r")) {
    freopen(NAME".inp", "r", stdin);
    freopen(NAME".out", "w", stdout);
  }
  cin.tie(0)->sync_with_stdio(0);

  int nq, n = 1;
  cin >> nq;

  FOR(i, 1, nq) {
    string s;
    cin >> s >> query[i].fi >> query[i].se;

    if (s == "Add") {
      type[i] = 1;

      adj[query[i].fi].push_back(++ n);
    }
  }

  dfs(1);
  seg.init(n);

  n = 1;

  FOR(i, 1, nq) {
    if (type[i]) {
      n ++;
      a[n] = a[query[i].fi] ^ query[i].se;
      seg.update(in[n], a[n]);
    }
    else {
      cout << seg.get(in[query[i].se], out[query[i].se], a[query[i].fi]) << "\n";
    }
  }

  return 0;
}

Compilation message (stderr)

klasika.cpp: In function 'int main()':
klasika.cpp:136:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  136 |     freopen(NAME".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
klasika.cpp:137:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  137 |     freopen(NAME".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 22
• Subtask 3: 0 / 33
• Subtask 4: 0 / 44