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  1. #include <bits/stdc++.h>
  2. #define NMAX  10005
  3. using namespace std;
  4. int n , k;
  5. int Male[NMAX] , Female[NMAX];
  6.  
  7. long long ans ;
  8.  
  9. void process()
  10. {
  11.         cin>> n >> k;
  12.         for(int i = 1 ; i <= n ; i++)
  13.         {
  14.                 int height;
  15.                 cin>>height;
  16.  
  17.                 if(height > 0)  Male[height]++;
  18.  
  19.                 if(height <= 0)  Female[-height]++;
  20.         }
  21.  
  22.         for(int i = 1 ; i < NMAX ; i++)  Male[i] += Male[i-1];
  23.  
  24.         ans += 1ll * Female[0] * Male[k];
  25.  
  26.         for(int height = 1 ; height < NMAX - k ; height++)
  27.         {
  28.                 ans += 1ll * Female[height] * (Male[height + k] - Male[height - 1]);
  29.         }
  30.  
  31.         cout<<ans;
  32. }
  33. int main()
  34. {
  35.     ios_base::sync_with_stdio(0);
  36.     cin.tie(nullptr);
  37.     cout.tie(nullptr);
  38.     process();
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 5324KB
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stdout 
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https://ideone.com/SfsGKa
language:
C++14 (gcc 8.3)
created:
40 days ago
visibility:
secret

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