code clean up in K problem : delete unused methods
code clean up in L problem : delete unused continue
code clean up in F problem : silly renaming
code clean up in B problem : get rid of recursion - use while-loop
code clean up in K problem : delete unused methods
Merge pull request #4 from pvasilyev/code-clean-up

Code clean up around K, L, F and B problems
Clean formating
XIV opencup, round 3 submissions
adding solutions from 17 Nov contest of round 4