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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.     int n;cin>>n;
  6.     int k;cin>>k;
  7.     vector<int> arr(n);
  8.     unordered_map<int,int> mp;
  9.     int count=0;
  10.     for(int j=0;j<n;j++)
  11.     {
  12.         cin>>arr[j];
  13.         int x=k+arr[j];
  14.         int y=arr[j]-k;
  15.         if(k==0)
  16.         {
  17.             count+=mp[x];
  18.         }
  19.         else
  20.         {count+=mp[x];
  21.          count+=mp[y];
  22.         }
  23.         mp[arr[j]]++;
  24.     }
  25.     cout<<count;
  26.  
  27.  
  28.  
  29.  
  30. }
  31.  
  32.  
  33.  
  34.  
Success #stdin #stdout 0.01s 5312KB
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stdin
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Standard input is empty
stdout
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-1652140543
https://ideone.com/Tb8fyR
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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