fork download
copy 
  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.     vector <int> uoc;
  12.     // co the dung mang khai bao sang cx dc vd : uoc[10005] neu ko quen dung vector
  13.  
  14.     // doan nay de tim uoc cua k
  15.     for(int i = 1; i <= k; i ++)if(k % i == 0)uoc.push_back(i);
  16.  
  17.     int f[100000 + 5];
  18.     //f[i] la so luong cac phan tu trong mang a chia het cho i
  19.  
  20.     long long ans = 0;
  21.     for(int i = 1; i <= n;i ++)
  22.     {
  23.         int need = 0;
  24.  
  25.         for(int u : uoc)
  26.         {
  27.             long long so = a[i] * u;
  28.             if(so % k == 0){need = u;break;}
  29.         }
  30.  
  31.         ans += (long long)f[need];
  32.  
  33.         for(int u : uoc)
  34.         {
  35.             if(a[i] % u  == 0)f[u] ++;
  36.         }
  37.     }
  38.     cout<<ans;
  39.  
  40.     return 0 ;
  41. }
  42.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
https://ideone.com/QfzgJF
language:
C++14 (gcc 8.3)
created:
16 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!