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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     int n;
  7.     long long k,a[100000 + 5];
  8.     cin>>n>>k;
  9.     for(int i = 1; i <= n;i ++)cin>>a[i];
  10.  
  11.     long long ans = 0; //dap an de bai
  12.     for(int i = 1; i <= n;i ++)for(int j = i + 1;j <= n; j++)
  13.     {
  14.         long long so = a[i] * a[j];
  15.         if(so % k == 0)ans++;//vi thoa man yeu cau de bai cho
  16.     }
  17.     cout<<ans;
  18.     return 0 ;
  19. }
  20.  
Success #stdin #stdout 0.01s 5296KB
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Standard input is empty
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Standard output is empty
https://ideone.com/4cvDmP
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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