1. Two Sum

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].

python

 
class Solution(object):
    def twoSum(self,nums, target):
        for a in range(0, len(nums)):
            for b in range(0, len(nums)):
                if (nums[a] + nums[b] == target and a != b):
                    return [a, b]