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Showing content from https://cplusplus.com/reference/algorithm/partial_sort_copy/ below:

function template

<algorithm>

std::partial_sort_copy default (1) 
template <class InputIterator, class RandomAccessIterator>  RandomAccessIterator    partial_sort_copy (InputIterator first,InputIterator last,                       RandomAccessIterator result_first,                       RandomAccessIterator result_last);
custom (2) 
template <class InputIterator, class RandomAccessIterator, class Compare>  RandomAccessIterator    partial_sort_copy (InputIterator first,InputIterator last,                       RandomAccessIterator result_first,                       RandomAccessIterator result_last, Compare comp);

Copy and partially sort range

Copies the smallest elements in the range [first,last) to [result_first,result_last), sorting the elements copied. The number of elements copied is the same as the distance between result_first and result_last (unless this is more than the amount of elements in [first,last)).

The range [first,last) is not modified.

The elements are compared using operator< for the first version, and comp for the second.



Parameters
first, last
Input iterators to the initial and final positions of the sequence to copy from. The range used is [first,last), which contains all the elements between first and last, including the element pointed by first but not the element pointed by last.
InputIterator shall point to a type assignable to the elements pointed by RandomAccessIterator.
result_first, result_last
Random-access iterators to the initial and final positions of the destination sequence. The range used is [result_first,result_last).
RandomAccessIterator shall point to a type for which swap is properly defined and which is both move-constructible and move-assignable.
comp
Binary function that accepts two elements in the result range as arguments, and returns a value convertible to bool. The value returned indicates whether the element passed as first argument is considered to go before the second in the specific strict weak ordering it defines.
The function shall not modify any of its arguments.
This can either be a function pointer or a function object.

Return value An iterator pointing to the element that follows the last element written in the result sequence.

Example 
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// partial_sort_copy example
#include <iostream>     // std::cout
#include <algorithm>    // std::partial_sort_copy
#include <vector>       // std::vector

bool myfunction (int i,int j) { return (i<j); }

int main () {
  int myints[] = {9,8,7,6,5,4,3,2,1};
  std::vector<int> myvector (5);

  // using default comparison (operator <):
  std::partial_sort_copy (myints, myints+9, myvector.begin(), myvector.end());

  // using function as comp
  std::partial_sort_copy (myints, myints+9, myvector.begin(), myvector.end(), myfunction);

  // print out content:
  std::cout << "myvector contains:";
  for (std::vector<int>::iterator it=myvector.begin(); it!=myvector.end(); ++it)
    std::cout << ' ' << *it;
  std::cout << '\n';

  return 0;
}

Output: 
myvector contains: 1 2 3 4 5


Complexity On average, less than linearithmic in the distance between first and last: Performs approximately N*log(min(N,M)) comparisons of elements (where N is this distance, and M is the distance between result_first and result_last). It also performs up to that many element swaps (or moves) and min(N,M) assignments between ranges.

Data races The objects in the range [first,last) are modified.

Exceptions Throws if any of the element comparisons, the element assignments, the element swaps (or moves) or the operations on iterators throws.
Note that invalid arguments cause undefined behavior.

See also
partial_sort
Partially sort elements in range (function template)
sort
Sort elements in range (function template)
copy
Copy range of elements (function template)
remove_copy_if
Copy range removing values (function template)

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