Two Sum

Problem:

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

 You may assume that each input would have exactly one solution, and you may not use the same element twice.

Example:

 Given nums = [2, 7, 11, 15], target = 9,

 Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].

https://leetcode.com/problems/two-sum/

Solution1: https://leetcode.com/submissions/detail/277898249/
Solution2: https://leetcode.com/submissions/detail/277899522/


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