 Schwartzian transform

The Schwartzian transform is a technique used in computer programming, particularly in languages like Perl and Ruby, to optimize sorting operations based on the results of complex computations. The basic idea of the Schwartzian transform is to: 1. **Map** the items to be sorted into pairs, where each pair consists of the computed value (the key used for sorting) and the original item. 2. **Sort** these pairs based on the computed values.