find and display v in highest 20th percentile : find « STL Algorithms Non modifying sequence operations « C++

1. C++
2. STL Algorithms Non modifying sequence operations
3. find

find and display v in highest 20th percentile

  
#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>

using namespace std;

int main( )
{
   const int a[] = { 8, 7, 4, 9, 5, 2, 6, 2, 7,9, };
   const int len = sizeof( a ) / sizeof( a[0] );

   const int percentile_20 = static_cast<int>( 0.2 * len );
   vector<int> v( a, a+len );

   copy( a, a+len, v.begin() );
   nth_element( v.begin(), v.begin()+percentile_20-1,v.end(), greater<int>() );

   copy( v.begin(), v.begin() + percentile_20,ostream_iterator<int>( cout, " " ) );

}
  
    
  

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