fork download
copy 
  1. #include <iostream>
  2. #include <algorithm>
  3. //#define space "1627D"
  4. using namespace std;
  5.  
  6. const int mn=1e6;
  7. int d[mn+5],n,ans=0;
  8. inline void faster()
  9. {
  10.     ios_base::sync_with_stdio(0);
  11.     cin.tie(0);
  12.     cout.tie(0);
  13. }
  14. void sol()
  15. {
  16.     cin >>n;
  17.     for (int i=1;i<=n;++i)
  18.     {
  19.         int x;
  20.         cin >>x;
  21.         d[x]=1;
  22.     }
  23.     for (int i=mn;i>=1;--i)
  24.     {
  25.         if (d[i]) continue;
  26.         int gcd=-1;
  27.         for (int j=2*i;j<=mn;j+=i)
  28.         {
  29.             if (d[j])
  30.             {
  31.                 if (gcd==-1) {
  32.  
  33.                     gcd = j/i;
  34.                 } else {
  35.  
  36.                     gcd = __gcd(gcd,j/i);
  37.                 }
  38.             }
  39.         }
  40.         if (gcd==1)
  41.         {
  42.             ans+=1;
  43.             d[i]=1;
  44.         }
  45.     }
  46.     cout <<ans<< endl;
  47. }
  48. int main()
  49. {
  50.     faster();
  51.     #ifdef space
  52.         freopen(space".inp", "r", stdin);
  53.         freopen(space".out", "w", stdout);
  54.     #endif // space
  55.     sol();
  56.     return 0;
  57. }
  58.  
Success #stdin #stdout 0.02s 5496KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
0
https://ideone.com/vf8f4P
language:
C++ (gcc 8.3)
created:
1 year 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!