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  1. #include <bits/stdc++.h>
  2. #define NMAX 100005
  3. using namespace std;
  4. int n , k;
  5. int Male[NMAX] , Female[NMAX];
  6. int NumMale , NumFemale;
  7.  
  8. long long ans ;
  9.  
  10. void process()
  11. {
  12.         cin>> n >> k;
  13.         for(int i = 1 ; i <= n ; i++)
  14.         {
  15.                 int height;
  16.                 cin>>height;
  17.  
  18.                 if(height > 0)   Male[++NumMale] = height;
  19.  
  20.                 if(height <= 0 ) Female[++NumFemale] = -height;
  21.         }
  22.  
  23.         sort(Male + 1 , Male + NumMale + 1);
  24.  
  25.         for(int i = 1 ; i <= NumFemale ; i++)
  26.         {
  27.                 int l = lower_bound(Male + 1 , Male + NumMale + 1 , Female[i])  - Male;
  28.  
  29.                 int r = upper_bound(Male + 1 , Male + NumMale + 1 , Female[i] + k) - Male - 1;
  30.  
  31.                 if(l <= r )ans += r - l + 1;
  32.         }
  33.  
  34.         cout<<ans;
  35. }
  36. int main()
  37. {
  38.     ios_base::sync_with_stdio(0);
  39.     cin.tie(nullptr);
  40.     cout.tie(nullptr);
  41.     process();
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0s 5320KB
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stdout 
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https://ideone.com/X0Zzg8
language:
C++14 (gcc 8.3)
created:
40 days ago
visibility:
secret

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