2. Linked List Isolation

If we can successfully do a operation on a linked list but in your subject linked list that is just a segment within the full Linked List, You can easily isolate the part of that linked list safely. Here we are treating positions to be starting from 1

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class ListNode:
    def __init__(self, val=0, next=None):
        self.val = val
        self.next = next


def process_sublist(start):
    return new_start, new_end


def solve(head):
    dummy = ListNode(0, head)
    # Find affected sublist
    before = ...
    end = ...
    # Save boundaries
    start = before.next
    after = end.next
    # Isolate
    end.next = None

    # Process isolated sublist
    new_start, new_end = process_sublist(start)

    # Reconnect
    before.next = new_start
    new_end.next = after

    return dummy.next