Letter Combinations of a Phone Number: Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent.
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Letter Case Permutation: Given a string s, you can transform every letter individually to be lowercase or uppercase to create another string.
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Set Matrix Zeroes: Given an m x n integer matrix matrix, if an element is 0, set its entire row and column to 0’s.
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Product of Array Except Self: Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i].
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Longest Consecutive Sequence: Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence.
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Find the Duplicate Number: Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive.
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