Submission #424998

#	Time	Username	Problem	Language	Result	Execution time	Memory
424998		MilosMilutinovic	XORanges (eJOI19_xoranges)	C++14	55 / 100	1083 ms	5176 KiB

xoranges

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, q;
  cin >> n >> q;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  while (q--) {
    int foo;
    cin >> foo;
    if (foo == 1) {
      int pos, x;
      cin >> pos >> x;
      --pos;
      a[pos] = x;
    } else {
      int l, r;
      cin >> l >> r;
      --l, --r;
      if (l % 2 != r % 2) {
        cout << 0 << '\n';
        continue;
      }
      int ans = 0;
      for (int i = l; i <= r; i += 2) {
        ans ^= a[i];
      }
      cout << ans << '\n';
    }
  }
  return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 25 / 25
• Subtask 4: 0 / 20
• Subtask 5: 0 / 25