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moidfy solutions

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Original file line number	Diff line number	Diff line change
`@@ -72,4 +72,5 @@ class Solution:`
`72`	`72`	`return root`
`73`	`73`	```
`74`	`74`
`75`		`-117 和116的差异在于常数空间占用,因为next指针本身提供了横向遍历的可能,所以用3个指针分别指向当前,上一个节点,以及下一行的初始节点`
	`75`	`+1. 117 和116的差异在于常数空间占用,因为next指针本身提供了横向遍历的可能,所以用3个指针分别指向当前,上一个节点,以及下一行的初始节点`
	`76`	`+2. 双层循环,外层是下一行,内层是每行遍历。pre指针是next的前节点,head是下一层的头节点。每一步cur向右移动,pre也向右移动`

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