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 haveexactlyone 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
].