Question:
Given an array of integers, returnindicesof 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 thesameelement twice.
Example:
Given nums = [2, 7, 11, 15], target = 9,Because nums[0] + nums[1] = 2 + 7 = 9,return [0,1].
Answer:
- method 1
note: this is more obvious, but less efficient;
- method 2
note: using a new object makes the code more efficient with only one loop~~
