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Merge pull request youngyangyang04#605 from shuwenlan/master

添加剑指Offer58-II.左旋转字符串 Python3版本使用模+下标

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`@@ -141,6 +141,18 @@ class Solution:`
`141`	`141`	`# 空间复杂度:O(n),python的string为不可变,需要开辟同样大小的list空间来修改`
`142`	`142`	```
`143`	`143`
	`144`	+```python 3
	`145`	`+#方法三:考虑不能用切片的情况下,利用模+下标实现`
	`146`	`+class Solution:`
	`147`	`+ def reverseLeftWords(self, s: str, n: int) -> str:`
	`148`	`+ new_s = ''`
	`149`	`+ for i in range(len(s)):`
	`150`	`+ j = (i+n)%len(s)`
	`151`	`+ new_s = new_s + s[j]`
	`152`	`+ return new_s`
	`153`	`+`
	`154`	+```
	`155`	`+`
`144`	`156`	`Go:`
`145`	`157`
`146`	`158`	```go

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