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array 24 problems binary-search 6 problems bit-manipulation 2 problems counting 6 problems design 1 problems greedy 1 problems hash-table 23 problems heap-priority-queue 1 problems linked-list 7 problems math 2 problems matrix 2 problems prefix-sum 11 problems recursion 1 problems simulation 2 problems sliding-window 13 problems sorting 7 problems stack 5 problems string 13 problems two-pointers 19 problems