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  1. /*
  2. * @Author: hungeazy
  3. * @Date:   2026-03-04 23:24:15
  4. * @Last Modified by:   hungeazy
  5. * @Last Modified time: 2026-03-13 21:11:37
  6. */
  7. #include <bits/stdc++.h>
  8. using namespace std;
  9. #define int long long 
  10. const int N = 100010;
  11. int n,q,a[N];
  12. vector<int> pos[N];
  13.  
  14. signed main()
  15. {
  16.     ios_base::sync_with_stdio(false); 
  17.     cin.tie(NULL); cout.tie(NULL);
  18.     cin >> n >> q;
  19.     for (int i = 1; i <= n; i++) 
  20.     {
  21.         cin >> a[i];
  22.         pos[a[i]].push_back(i);
  23.     }
  24.     for (int i = 1; i <= q; i++)
  25.     {
  26.         int l,r,x;
  27.         cin >> l >> r >> x;
  28.         int L = 0, R = pos[x].size()-1, jMin = -1, jMax = -1;
  29.         while (L <= R)
  30.         {
  31.             int mid = (L+R)>>1;
  32.             if (pos[x][mid] >= l) 
  33.             {
  34.                 jMin = mid;
  35.                 R = mid-1;
  36.             }
  37.             else L = mid+1;
  38.         }
  39.         L = 0, R = pos[x].size()-1;
  40.         while (L <= R)
  41.         {
  42.             int mid = (L+R)>>1;
  43.             if (pos[x][mid] <= r)
  44.             {
  45.                 jMax = mid;
  46.                 L = mid+1;
  47.             }
  48.             else R = mid-1;
  49.         }
  50.         if (jMin != -1 and jMax != -1) cout << jMax-jMin+1 << endl;
  51.         else cout << 0 << endl;
  52.     }
  53.     return 0;
  54. }
Success #stdin #stdout 0.01s 6268KB
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https://ideone.com/7onnSv
language:
C++14 (gcc 8.3)
created:
7 hours ago
visibility:
public

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