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  1. #include<iostream>
  2. #include<unordered_set>
  3. using namespace std;
  4. unordered_set<int> s;
  5. int main()
  6. {
  7.   int n, k, val;
  8.   cin >> n >> k;
  9.   for (int i = 0; i < n; i++)
  10.   {
  11.     cin >> val;
  12.     s.insert(val);
  13.   }
  14.   int ans = 0;
  15.   for (unordered_set<int>::iterator it = s.begin(); it != s.end(); ++it)
  16.     if (s.find(*it + k) != s.end()) ans++;
  17.   cout << ans << endl;
  18.   return 0;}
Success #stdin #stdout 0s 15240KB
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https://ideone.com/ojTLUm
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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