add 80 & 81 #13

Original file line number	Diff line number	Diff line change
Expand Up		@@ -690,6 +690,23 @@ class Solution:
		from itertools import combinations
		return sum([list(combinations(nums, i)) for i in range(len(nums) + 1)], [])
		```

	## [80. 删除排序数组中的重复项 II 4行](https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array-ii/)
	```python
	def removeDuplicates(nums: [int]) -> int:
	for i in range(len(nums)-3, -1, -1):
	if nums[i] == nums[i+1] and nums[i] == nums[i+2]:
	nums.pop(i)
	return len(nums)
	```
	- 从尾部开始考虑

	## [81. 搜索旋转排序数组 II 1行](https://leetcode-cn.com/problems/search-in-rotated-sorted-array-ii/)
	```python
	def search(nums: [int], target: int) -> bool:
	return target in nums
	```

		## [83. Remove Duplicates from Sorted List 3行](https://leetcode.com/problems/remove-duplicates-from-sorted-list/)
		```python
		# Definition for singly-linked list.
Expand Down

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