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].
Note:
---
利用字典(hashmap)的快速查找
class Solution:
def twoSum(self, nums, target):
"""
:type nums: List[int]
:type target: int
:rtype: List[int]
"""
dictionary = {} # 创建字典,将元素都放进字典中
for i in range(len(nums)):
dictionary[nums[i]] = i
for i in range(len(nums)):
complement = target - nums[i]
if complement in dictionary.keys():
if dictionary.get(complement) != i:
x = [i, dictionary.get(complement)]
return x
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