我的代码之路，更新!

1 setdefault(key,[])

data = [("p", 1), ("p", 2), ("p", 3),
        ("h", 1), ("h", 2), ("h", 3)]
for (key, value) in data:
    result.setdefault(key, []).append(value)
    print(result)#'p': [1, 2, 3], 'h': [1, 2, 3]}

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作者：wanghua609
来源：优快云
原文：https://blog.youkuaiyun.com/weixin_38145317/article/details/93175217
版权声明：本文为博主原创文章，转载请附上博文链接！

2 TwoSum(sorted)

说明：
Input: numbers = [2,7,11,15], target = 9
Output: [1,2]
Explanation: The sum of 2 and 7 is 9. Therefore index1 = 1, index2 = 2.

class Solution:
    def twoSum(self, numbers: List[int], target: int) -> List[int]:
        i = 0
        j = len(numbers)-1
        while i<j:
            if numbers[i] + numbers[j] == target:
                return [i+1,j+1]
            elif numbers[i] + numbers[j] > target:
                j-= 1
            else:
                i += 1
        return [i,j]

3 twoSum no sorted

class Solution:
    def twoSum(self, nums: List[int], target: int) -> List[int]:
        dict ={}
        for i in range(len(nums)):
            if target - nums[i] not in dict:
                dict[nums[i]] = i
            else:
                return [dict[target-nums[i]],i]

4.