Check out example codes for "nth_element c++". It will help you in understanding the concepts better.

Code Example 1

// C++ program to demonstrate the use of std::nth_element 
#include <iostream> 
#include <algorithm> 
using namespace std; 
int main() 
{ 
    int v[] = { 3, 2, 10, 45, 33, 56, 23, 47 }, i; 
  
    // Using std::nth_element with n as 5 
    std::nth_element(v, v + 4, v + 8); 
  
    // Since, n is 5 so 5th element should be sorted 
    for (i = 0; i < 8; ++i) { 
        cout << v[i] << " "; 
    } 
    return 0; 
}

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