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Question : Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. Input: 38 Output: 2 Explanation: The process is like: 3 + 8 = 11, 1 + 1 = 2. Since 2 has only one digit, return it.Question Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would hav..