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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. ll nthprime(ll n)
  18. {
  19.     vector<bool> nums(10000000,true);
  20.     ll cnt = 0;
  21.     ll sz = nums.size() -1;
  22.     for (ll i = 2; i <= sz; i++)
  23.     {
  24.         if(nums[i])
  25.         {
  26.             cnt++;
  27.             if(cnt == n)
  28.             {
  29.                 return i;
  30.             }
  31.             for (ll j = i*i; j <= sz; j+=i)
  32.             {
  33.                 nums[j] = false;
  34.             }
  35.  
  36.         }
  37.     }
  38.     return -1;
  39. }
  40.  
  41. int main()
  42. {
  43.     ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
  44.     ll n ; cin >> n;
  45.     cout << nthprime(n);
  46. }
Success #stdin #stdout 0.06s 5320KB
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https://ideone.com/JJ8Vc3
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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