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  1. #include <bits/stdc++.h>
  2. #include <ext/pb_ds/assoc_container.hpp>
  3. #include <ext/pb_ds/tree_policy.hpp>
  4.  
  5. using namespace std;
  6. using namespace __gnu_pbds;
  7. using ll = long long;
  8. using ld = long double;
  9.  
  10. #define all(x)  x.begin(),x.end()
  11. #define v(x) vector<x>
  12. #define nl '\n'
  13. #define fxd(x) fixed << setprecision(x)
  14. template<class t> using ordered_set = tree<t, null_type, less<t>, rb_tree_tag, tree_order_statistics_node_update>;
  15. template<class t> using ordered_multiset = tree<t, null_type, less_equal<t>, rb_tree_tag, tree_order_statistics_node_update>;
  16.  
  17.  
  18. vector<bool> nums(1000005,true);
  19.  
  20. void sieve()
  21. {
  22.     ll sz = nums.size()-1;
  23.     for (ll i = 2; i <= sz; i++)
  24.     {
  25.         if(nums[i])
  26.         {
  27.             for (ll j = i*i; j <= sz; j+=i)
  28.             {
  29.                 nums[j] = false;
  30.             }
  31.  
  32.         }
  33.     }
  34.     return;
  35. }
  36.  
  37. int main()
  38. {
  39.     ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
  40.     nums[0] = false;
  41.     nums[1] = false;
  42.     ll n ; cin >> n;
  43.     sieve();
  44.     while (n--)
  45.     {
  46.         double x; cin >> x;
  47.         double s = sqrt(x); ll w = s;
  48.         if(s == (double)w && nums[w])
  49.         {
  50.             cout << "YES" <<nl;
  51.         }
  52.         else
  53.         {
  54.             cout << "NO" << nl;
  55.         }
  56.     } 
  57.  
  58. }
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/1wR1P2
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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