Commit f7cdfd7

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O(n) time and O(logn) space for recursive stack

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Lines changed: 4 additions & 7 deletions

Original file line number	Diff line number	Diff line change
`@@ -28,16 +28,13 @@ def __init__(self, val, left, right, next):`
`28`	`28`	`self.next = next`
`29`	`29`	`"""`
`30`	`30`	`class Solution:`
`31`		`- def connect(self, root: 'Node') -> 'Node':`
`32`		`- if not root:`
`33`		`- return None`
`34`		`- if root.left:`
`35`		`- root.left.next = root.right`
	`31`	`+ def connect(self, root: 'Optional[Node]') -> 'Optional[Node]':`
	`32`	`+ if not root: return None`
`36`	`33`	`if root.right:`
	`34`	`+ if root.left:`
	`35`	`+ root.left.next = root.right`
`37`	`36`	`if root.next:`
`38`	`37`	`root.right.next = root.next.left`
`39`		`- else:`
`40`		`- root.right.next = None`
`41`	`38`	`self.connect(root.left)`
`42`	`39`	`self.connect(root.right)`
`43`	`40`	`return root`

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