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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. #define Kirlos ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
  4. #define ll long long
  5. #define pb(k) push_back(k)
  6. #define fi first
  7. #define se second
  8. #define endl '\n'
  9. #define mp(x,y) make_pair(x,y)
  10. #define MOD 1000000007
  11. #define all(x) x.begin(), x.end()
  12. #define PI acos(-1)
  13. #define sin(x) sin((x)*PI/180)
  14. #define cos(x) cos((x)*PI/180)
  15. #define tan(x) tan((x)*PI/180)
  16. #define Ones(x) __builtin_popcountll(x)
  17.  
  18. using namespace std;
  19.  
  20. void solve()
  21. {
  22.     ll n,k;
  23.     cin>>n>>k;
  24.     vector<ll>div;
  25.     for(int i=1; (ll)i*i<=n; i++)
  26.     {
  27.         if(n%i==0)
  28.         {
  29.             div.push_back(i);
  30.             if(n/i!=i)
  31.             {
  32.                 div.push_back(n/i);
  33.             }
  34.         }
  35.     }
  36.     sort(all(div));
  37.     if(k>div.size())
  38.     {
  39.         cout<<-1;
  40.     }
  41.     else
  42.     {
  43.         cout<<div[k-1];
  44.     }
  45. }
  46.  
  47. int main()
  48. {
  49.     Kirlos
  50.     ll t;
  51.     t=1;
  52.     //cin>>t;
  53.     while(t--)
  54.     {
  55.         solve();
  56.     }
  57.     return 0;
  58. }
Success #stdin #stdout 0.06s 5404KB
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https://ideone.com/ZIfpOp
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
secret

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