Leetcode Two Sum – solution – V1

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].

My first version:

 

nested two for loops, find the two value sum == target

 

My second version:

also two loops: the first loop is the same, but the second loop starts from x+1, no need to start index 0.

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