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  1. #include <iostream>
  2. using namespace std;
  3. int kth(int *arr, int l,int r,int k)
  4. {
  5.     long long x = arr[(l+r) / 2];
  6.     int i=l,j=r;
  7.     while(i<=j)
  8.     {
  9.         while(arr[i] < x) i++;
  10.         while(arr[j] > x) j--;
  11.  
  12.         if(i<=j)
  13.         {
  14.             std::swap(arr[i],arr[j]);
  15.             i++;
  16.             j--;
  17.         }
  18.     }
  19.     if(l<=k && k<=j)
  20.         return kth(arr, l,j,k);
  21.     if( i<=k && k<=r)
  22.         return kth(arr, i,r,k);
  23.     return arr[k];
  24. }
  25.  
  26. int main() {
  27. 	int a[4] = {3, 6, 4, 5};
  28. 	cout << kth(a, 0, 4, 1) << endl;
  29. 	cout << kth(a, 0, 4, 2) << endl;
  30. 	cout << kth(a, 0, 4, 3) << endl;
  31. 	cout << kth(a, 0, 4, 4) << endl;
  32. 	return 0;
  33. }
Runtime error #stdin #stdout 0s 3412KB
comments (?)
stdin 
Standard input is empty
stdout 
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https://ideone.com/ijhglI
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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