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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  6.  
  7.     int n, k;
  8.     cin >> n >> k;
  9.     int count = 0;
  10.  
  11.     // Iterate from 1 to sqrt(n)
  12.     for (int i = 1; i * i <= n; i++) {
  13.         if (n % i == 0) {
  14.             count++;  // Found a divisor
  15.             if (count == k) {
  16.                 cout << i << "\n";  // Print the k-th smallest divisor
  17.                 return 0;  
  18.             }
  19.  
  20.             // Check the paired divisor n/i, only if it's different
  21.             if (i != n / i) {
  22.                 count++;
  23.                 if (count == k) {
  24.                     cout << n / i << "\n";  // Print the paired divisor
  25.                     return 0;  
  26.                 }
  27.             }
  28.         }
  29.     }
  30.  
  31.     // If the k-th divisor doesn't exist
  32.     cout << -1 << "\n";
  33.     return 0;
  34. }
  35.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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-1
https://ideone.com/gCjJJ9
language:
C++ (gcc 8.3)
created:
86 days ago
visibility:
public

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