Added Ejercicios de Programacion creativos y recreativos en C++
Merge branch 'master' of https://github.com/vhf/free-programming-books

Conflicts:
	free-programming-books-es.md
[en] Added Algorithms and Complexity
[en] Added The Design of Approximation Algorithms
[en] Two Algorithms books/lectures from University of North Texas
[es] Added Análisis de Algoritmos
Merge pull request #404 from JIghtuse/master

Add parallel technologies and HPC materials
Merge pull request #405 from esparta/master

[en] 4 algorithm books, [es] +1 C++ book, +1 Algorithm