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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <set>
  4. using namespace std;
  5.  
  6. int contar_pares(int diff, set<int> numeros){
  7.     int cont = 0;
  8.     for (auto num: numeros){
  9.         if (numeros.find(num - diff) != numeros.end()){
  10.             cont++;
  11.         }
  12.         if (numeros.find(num + diff) != numeros.end()){
  13.             cont++;
  14.         }
  15.     }
  16.     return cont / 2;
  17. }
  18.  
  19. int main(){
  20.     int n, k;
  21.     cin >> n >> k;
  22.     int tamanho = n;
  23.     set<int> numeros;
  24.     for(int i = 0; i < tamanho; i++){
  25.         int num;
  26.         cin >> num;
  27.         numeros.insert(num);
  28.     }
  29.     cout << contar_pares(k, numeros) << endl;
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
5 2  

1 5 3 4 2
stdout 
3
https://ideone.com/Q5XUom
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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