Weiss, Data Structures and Algorithm Analysis in Java, Chapters 2-5, 6-6.4, 6.9, 7, 9-9.3, 9.5; class lecture notes; MapReduce paper.

Internal Implementation: Backed by a dynamic array (resizable array). The array starts with a default capacity of 10 and grows by approximately 1.5x when full, copying elements to a new array. Key ...

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Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below.