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April 24, 2018 18:11
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Reverse a linked list using iteration.
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| class Node: | |
| def __init__(self, data): | |
| self.data=data | |
| self.nex=None | |
| def revList(head): | |
| trail=head | |
| cur=head.nex | |
| temp=cur.nex | |
| trail.nex=None | |
| while(temp!=None): | |
| cur.nex=trail | |
| trail=cur | |
| cur=temp | |
| temp=temp.nex | |
| cur.nex=trail | |
| start=cur | |
| return start | |
| #create list here | |
| lls=Node(1) | |
| lls.nex=Node(2) | |
| lls.nex.nex=Node(3) | |
| lls.nex.nex.nex=Node(4) | |
| lls.nex.nex.nex.nex=Node(5) | |
| lls.nex.nex.nex.nex.nex=Node(6) | |
| lls.nex.nex.nex.nex.nex.nex=Node(7) | |
| #helper function to print a given list | |
| def printList(head): | |
| cur=head | |
| while (cur!=None): | |
| print(cur.data) | |
| cur=cur.nex | |
| printList(revList(lls)) | |
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