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.

class Solution(object):
    def twoSum(self, nums, target):
        :type nums: List[int]
        :type target: int
        :rtype: List[int]
        for i in range(len(nums)):
            for j in range(i+1,len(nums)):
                if nums[i]+nums[j]==target:
                    return [i,j]
        return 0