This was already posted under a different link. https://techiedelight.quora.com/500-Data-Structures-and-Algorithms-practice-problems-and-their-solutions?__filt

This was already posted under a different link. https://techiedelight.quora.com/500-Data-Structures-and-Algorithms-practice-problems-and-their-solutions?__filter__&__nsrc__=2&__snid3__=1594232728&share=1# https://techiedelight.quora.com/500-Data-Structures-and-Algo... In fact it seems as the author on Medium "forgot" to mention his sources.