[Solved] LeetCode Remove Nth Node From End of List – Linked List [closed]

Question

I don’t understand how this change modifies the head too. I thought curr was just a variable.

If this assignment were an assignment to curr you’d be right, and it wouldn’t mutate the list, but the assignment is not to curr, but to curr.next, and that is not a variable, but an attribute of a node in your list. By assigning to that attribute, you effectively mutate that node, and by consequence the list.

Accepted Answer

I don’t understand how this change modifies the head too. I thought curr was just a variable.

If this assignment were an assignment to curr you’d be right, and it wouldn’t mutate the list, but the assignment is not to curr, but to curr.next, and that is not a variable, but an attribute of a node in your list. By assigning to that attribute, you effectively mutate that node, and by consequence the list.