Hand of Straights
Given array hand and groupSize, check if cards can form groups of consecutive cards Each group must have groupSize consecutive cards Example: hand = [1,2,3,6,2,3,4,7,8], groupSize = 3 => true Can form [1,2,3], [2,3,4], [6,7,8]
Hand of Straights looks straightforward, but it quietly checks whether you reach for the right lookup structure. Interviewers love it because it reveals your data-structure instincts and your edge-case discipline. Watch your edge cases around repeats, and be clear about what your map is storing.
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