1-two-sum.py

"""
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].
"""


class Solution:
    def twoSum(self, nums, target):
        """
        :type nums: List[int]
        :type target: int
        :rtype: List[int]
        """
        table = {}
        for i, val in enumerate(nums):
            x = target - val
            if x in table:
                return [table[x], i]
            else:
                table[val] = i
        return []


if __name__ == "__main__":
    nums, target = [2, 7, 11, 15], 9
    print(Solution().twoSum(nums, target))