made a global reformat.
made a global reformat.
made a global reformat.
cleaned and separated problems up to 6
cleaned and separated problems up to 6
cleaned up to pb020.
cleaned up to pb030.
cleaned up to pb030.
completely cleaned. Problems up to 50 solved. Some problems in the range 51-55 not okay yet. Some solutions (mostly about primes) need optimisation because they are horribly slow.