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Update Swap_Nodes_in_Pairs.py

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+23

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Lines changed: 23 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# Solution - 1: Time: O(N) and Space: O(1)`
	`1`	`+# Solution - 1: Swapping the Nodes \| Time: O(N) and Space: O(1)`
`2`	`2`	`class Solution:`
`3`	`3`	`def swapPairs(self, head: Optional[ListNode]) -> Optional[ListNode]:`
`4`	`4`	`# Base condition`
`@@ -21,3 +21,25 @@ def swapPairs(self, head: Optional[ListNode]) -> Optional[ListNode]:`
`21`	`21`	`p2 = p1.next`
`22`	`22`
`23`	`23`	`return t_head`
	`24`	`+`
	`25`	`+`
	`26`	`+# Solution - 2: Swapping the Values \| Time: O(N) and Space: O(1)`
	`27`	`+class Solution:`
	`28`	`+ def swapPairs(self, head: ListNode) -> ListNode:`
	`29`	`+ if not head or not head.next:`
	`30`	`+ return head`
	`31`	`+ p1, p2 = head, head.next`
	`32`	`+ t_head = head`
	`33`	`+`
	`34`	`+ while p1 and p2:`
	`35`	`+ temp = p2.val`
	`36`	`+ p2.val = p1.val`
	`37`	`+ p1.val = temp`
	`38`	`+`
	`39`	`+ if p2.next and p2.next.next:`
	`40`	`+ p1 = p2.next`
	`41`	`+ p2 = p1.next`
	`42`	`+ else:`
	`43`	`+ break`
	`44`	`+`
	`45`	`+ return head`

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