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Update 0704.二分查找.md

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Original file line number	Diff line number	Diff line change
`@@ -218,19 +218,21 @@ class Solution:`
`218`	`218`
`219`	`219`	`(版本二)左闭右开区间`
`220`	`220`
`221`		-```python
`222`		`-class Solution:`
	`221`	+```class Solution:
`223`	`222`	`def search(self, nums: List[int], target: int) -> int:`
`224`		`- left,right =0, len(nums)`
`225`		`- while left < right:`
`226`		`- mid = (left + right) // 2`
`227`		`- if nums[mid] < target:`
`228`		`- left = mid+1`
`229`		`- elif nums[mid] > target:`
`230`		`- right = mid`
	`223`	`+ if nums is None or len(nums)==0:`
	`224`	`+ return -1`
	`225`	`+ l=0`
	`226`	`+ r=len(nums)-1`
	`227`	`+ while (l<=r):`
	`228`	`+ m = round(l+(r-l)/2)`
	`229`	`+ if nums[m] == target:`
	`230`	`+ return m`
	`231`	`+ elif nums[m] > target:`
	`232`	`+ r=m-1`
`231`	`233`	`else:`
`232`		`- return mid`
`233`		`- return -1`
	`234`	`+ l=m+1`
	`235`	`+ return -1`
`234`	`236`	```
`235`	`237`
`236`	`238`	`Go:`

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