oj.uz

Submission #425017

# Submission time Handle Problem Language Result Execution time Memory
425017 2021-06-12T12:28:16 Z MilosMilutinovic XORanges (eJOI19_xoranges) C++14
100 / 100
 209 ms 11224 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 3e5 + 5;
const int M = 4 * N;

int a[N], st[M][2];

void build(int node, int l, int r) {
  if (l > r) return;
  if (l == r) {
    st[node][l % 2] = a[l];
    return;
  }
  int mid = l + r >> 1;
  build(node * 2, l, mid);
  build(node * 2 + 1, mid + 1, r);
  st[node][0] = st[node * 2][0] ^ st[node * 2 + 1][0];
  st[node][1] = st[node * 2][1] ^ st[node * 2 + 1][1];
}

void update(int node, int l, int r, int pos) {
  if (l > r) {
    return;
  }
  if (l == r) {
    st[node][l % 2] = a[l];
    return;
  }
  int mid = l + r >> 1;
  if (pos <= mid) update(node * 2, l, mid, pos);
   else update(node * 2 + 1, mid + 1, r, pos);
  st[node][0] = st[node * 2][0] ^ st[node * 2 + 1][0];
  st[node][1] = st[node * 2][1] ^ st[node * 2 + 1][1];
}

int get(int node, int l, int r, int ll, int rr, int p) {
  if (l > r || l > rr || r < ll) return 0;
  if (ll <= l && r <= rr) return st[node][p];
  int mid = l + r >> 1;
  return get(node * 2, l, mid, ll, rr, p) ^ get(node * 2 + 1, mid + 1, r, ll, rr, p);
}

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

Compilation message

xoranges.cpp: In function 'void build(int, int, int)':
xoranges.cpp:16:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   16 |   int mid = l + r >> 1;
      |             ~~^~~
xoranges.cpp: In function 'void update(int, int, int, int)':
xoranges.cpp:31:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   31 |   int mid = l + r >> 1;
      |             ~~^~~
xoranges.cpp: In function 'int get(int, int, int, int, int, int)':
xoranges.cpp:41:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   41 |   int mid = l + r >> 1;
      |             ~~^~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 204 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 4 ms 588 KB Output is correct
12 Correct 4 ms 588 KB Output is correct
13 Correct 4 ms 604 KB Output is correct
14 Correct 4 ms 588 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 170 ms 10068 KB Output is correct
2 Correct 193 ms 11204 KB Output is correct
3 Correct 171 ms 11224 KB Output is correct
4 Correct 150 ms 10796 KB Output is correct
5 Correct 146 ms 10832 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 4 ms 588 KB Output is correct
12 Correct 4 ms 588 KB Output is correct
13 Correct 4 ms 604 KB Output is correct
14 Correct 4 ms 588 KB Output is correct
15 Correct 170 ms 10068 KB Output is correct
16 Correct 193 ms 11204 KB Output is correct
17 Correct 171 ms 11224 KB Output is correct
18 Correct 150 ms 10796 KB Output is correct
19 Correct 146 ms 10832 KB Output is correct
20 Correct 163 ms 10912 KB Output is correct
21 Correct 209 ms 10960 KB Output is correct
22 Correct 176 ms 10892 KB Output is correct
23 Correct 169 ms 10788 KB Output is correct
24 Correct 157 ms 10820 KB Output is correct