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Merge pull request #4 from janeyziqinglin/janeyziqinglin-patch-4

Update 0209.长度最小的子数组python版本

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Original file line number	Diff line number	Diff line change
`@@ -179,8 +179,27 @@ class Solution:`
`179`	`179`	`index += 1`
`180`	`180`	`return 0 if res==float("inf") else res`
`181`	`181`	```
`182`		`-`
`183`		`-`
	`182`	+```python3
	`183`	`+#滑动窗口`
	`184`	`+class Solution:`
	`185`	`+ def minSubArrayLen(self, target: int, nums: List[int]) -> int:`
	`186`	`+ if nums is None or len(nums)==0:`
	`187`	`+ return 0`
	`188`	`+ lenf=len(nums)+1`
	`189`	`+ total=0`
	`190`	`+ i=j=0`
	`191`	`+ while (j<len(nums)):`
	`192`	`+ total=total+nums[j]`
	`193`	`+ j+=1`
	`194`	`+ while (total>=target):`
	`195`	`+ lenf=min(lenf,j-i)`
	`196`	`+ total=total-nums[i]`
	`197`	`+ i+=1`
	`198`	`+ if lenf==len(nums)+1:`
	`199`	`+ return 0`
	`200`	`+ else:`
	`201`	`+ return lenf`
	`202`	+```
`184`	`203`	`Go:`
`185`	`204`	```go
`186`	`205`	`func minSubArrayLen(target int, nums []int) int {`

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