Submission #1092417

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092417		juicy	XOR (IZhO12_xor)	C++17	100 / 100	81 ms	44824 KiB

xor

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

const int N = 25e4 + 5, M = 7500005, LG = 30;

int n, k, node = 1;
int a[N], nxt[M][2], lst[M];

void add(int x, int i) {
  int p = 1;
  for (int j = LG - 1; ~j; --j) {
    int c = x >> j & 1;
    if (!nxt[p][c]) {
      nxt[p][c] = ++node;
    }
    p = nxt[p][c];
    lst[p] = min(lst[p], i);
  }
}

int qry(int x) {
  int m = 1e9, p = 1;
  for (int j = LG - 1; ~j; --j) {
    int c = x >> j & 1, d = k >> j & 1;
    if (!d && nxt[p][c ^ 1]) {
      m = min(m, lst[nxt[p][c ^ 1]]);
    }
    if (!nxt[p][c ^ d]) {
      return m;
    }
    p = nxt[p][c ^ d];
  }
  return min(m, lst[p]);
}

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

  cin >> n >> k;
  array<int, 2> res{};
  memset(lst, 0x3f, sizeof(lst));
  for (int i = 1; i <= n; ++i) {
    cin >> a[i];
    a[i] ^= a[i - 1];
    add(a[i - 1], i);
    int l = qry(a[i]);
    res = max(res, {i - l + 1, -l});
  }
  cout << -res[1] << " " << res[0];
  return 0;
}

• Subtask 1: 100 / 100