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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void build(int *tree, int *a, int i, int tl, int tr)
  5. {
  6.     if (tl == tr)
  7.     {
  8.         tree[i] = a[tl];
  9.         return;
  10.     }
  11.  
  12.     int mid = (tl + tr) / 2;
  13.     build(tree, a, 2 * i, tl, mid);
  14.     build(tree, a, 2 * i + 1, mid + 1, tr);
  15.     tree[i] = tree[2 * i] ^ tree[2 * i + 1];
  16. }
  17.  
  18. int query(int *tree, int i, int tl, int tr, int l, int r)
  19. {
  20.  
  21.     if (tr < l || tl > r)
  22.     {
  23.         return 0;
  24.     }
  25.  
  26.     if (l <= tl && tr <= r)
  27.     {
  28.         return tree[i];
  29.     }
  30.  
  31.     /// partial overlap part here
  32.     int mid = (tl + tr) / 2;
  33.     int left_child = query(tree, 2 * i, tl, mid, l, r);
  34.     int right_child = query(tree, 2 * i + 1, mid + 1, tr, l, r);
  35.     return left_child ^ right_child;
  36. }
  37. int main()
  38. {
  39.     int n;
  40.     cin >> n;
  41.     int q;
  42.     cin >> q;
  43.     int a[n];
  44.  
  45.     for (int i = 0; i < n; i++)
  46.     {
  47.         cin >> a[i];
  48.     }
  49.  
  50.     int tree[4 * n];
  51.  
  52.     build(tree, a, 1, 0, n - 1);
  53.  
  54.     while (q--)
  55.     {
  56.         int l, r;
  57.         cin >> l >> r;
  58.         l--, r--;
  59.         int ans = query(tree, 1, 0, n - 1, l, r);
  60.  
  61.         cout << ans << endl;
  62.     }
  63.  
  64.     return 0;
  65. }
  66.  
Success #stdin #stdout 0s 5316KB
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https://ideone.com/m4YuVn
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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