C# to D

[Dennis Ritchie via Digitalmars-d-learn]

On Wednesday, 25 March 2015 at 19:01:43 UTC, bearophile wrote:
> One solution:

Thanks.

On Wednesday, 25 March 2015 at 19:03:27 UTC, bearophile wrote:
> But calling "count" for each item is not efficient (in both C# 
> and D). If your array is largish, then you need a more 
> efficient solution.

A more effective solution for C ++:

#include <iostream>
#include <vector>
#include <range/v3/all.hpp>

int main() {
   using namespace ranges;

   auto rng = istream<int>( std::cin )
            | to_vector
            | action::sort
            | view::group_by( std::equal_to<int>() )
            | copy
            | action::stable_sort( []( const auto& e1, const auto& 
e2 ) { return distance( e1 ) < distance( e2 ); } );
   std::cout << ( rng );
}