Implementation of Problem 67 whcih is the smae as problem18
Found bug and wrote commnets on how to fix it
Replaced single sum list with version which computes all the partial sums but this implementation is not correct yet
removed some useless stuff and refactored some function. Still takes ages.
Rewwrote everything with vector and fixed it such that it works for Problem18. Still not good enough for 67, as it is too slow
Merge branch 'master' of github.com:mihaelacr/ProjectEuler