Yavorski 9f3561d291 Fix Stack pop comlexity to be O(1) (#214) ...

* By definition Stack push/pop time complexity should be O(1).
* Fix is applied by removing head instead of tail in pop method.
* Push method now do preprend instead of append.
* Fix consistency between toString and toArray methods.

2018-09-24 07:31:18 +03:00

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