1：暴力

class Solution:
def twoSum(self, nums, target):
for i in range(len(nums)):
for j in range(i + 1, len(nums)):
if (nums[i] + nums[j] == target):
return [i, j]
pass
pass
return None`

2: HASH两遍

#HASH表中，将键值装桶中 (key value) key是键值(要查找的值), value(index)是桶，是地址
#hashmap[key]=value or hashmap[nums]=index

hashmap = {}
for index, num in enumerate(nums):
hashmap[num] = index
for index, num in enumerate(nums):
another_num = target - num
if another_num in hashmap and hashmap[another_num] != index:
return [index, hashmap[another_num]]
return None

3: HASH 1遍

#边找边放，相当于从后往前找

 hashmap = {}
for index, num in enumerate(nums):
another_num = target - num
if another_num in hashmap:
return [hashmap[another_num], index]
hashmap[num] = index
return None

最后

以上就是坚强柚子为你收集整理的两数之和的三种解法 使用python 力扣1：暴力2: HASH两遍3: HASH 1遍的全部内容，希望文章能够帮你解决两数之和的三种解法 使用python 力扣1：暴力2: HASH两遍3: HASH 1遍所遇到的程序开发问题。

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