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https://medium.com/@alimirio/how-to-solve-problems-on-leetcode-to-prepare-for-technical-interviews-e74781b865d2 (advice on deep focus)
LIST OF ALGORITHMS AND DS TO UNDERSTAND:
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Hash tables
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Linked lists
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Breadth-first search, depth-first search
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Quicksort, merge sort
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Binary search
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2D arrays
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Dynamic arrays
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Binary search trees
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Dynamic programming
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Big-O analysis