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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int long long 
  4. vector<int> vec;
  5. int n, k;
  6.  
  7. int recur(int l, int r) {
  8.     int ans = 0;
  9.     if (l + 1 >= r) {
  10.         return ans;
  11.     }
  12.     int mid = (l + r) / 2;
  13.     ans += recur(l, mid);
  14.     ans += recur(mid, r);
  15.     cout << l << " " << r << endl; 
  16.     // Debugging output
  17.     // cout << l << " " << r << endl;
  18.  
  19.     // Count inversions
  20.  
  21.     // int ans1 = 0;
  22.     for(int i = l, j = mid; i < mid; i++){
  23.     	while(j < r && vec[i] >= vec[j] + k) j++;
  24.     	ans += j - mid;
  25.     }
  26.  
  27. 	// cout << ans1 << endl; 
  28.     inplace_merge(vec.begin() + l, vec.begin() + mid, vec.begin() + r);
  29.     return ans;
  30. }
  31.  
  32. signed main() {
  33. 	cin.tie(0);
  34. 	ios::sync_with_stdio(false);
  35.     cin >> n >> k;
  36.     vec.resize(n);
  37.     for (int i = 0; i < n; i++) {
  38.         cin >> vec[i];
  39.     }
  40.     cout << recur(0, n) << endl;
  41. }
Success #stdin #stdout 0s 5276KB
comments (?)
stdin
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6 2
1 2 3 4 5 6
stdout
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1 3
0 3
4 6
3 6
0 6
0
https://ideone.com/cxrojn
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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