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To insert an element in a linked list, you need a pointer to the new element, and a pointer to the target element. Set new.next = target.next, and then set target.next = new. This will insert new after target. To insert before target, you need the pointer to the element brfore target, and you can find that by searching from top until you find an element where element.next == target. To insert at top, a special case, you set new.next = top, and then set top = new.

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