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class Solution { | ||
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public ListNode modifiedList(int[] nums, ListNode head) { | ||
// Create a HashSet for efficient lookup of values in nums | ||
Set<Integer> valuesToRemove = new HashSet<>(); | ||
for (int num : nums) { | ||
valuesToRemove.add(num); | ||
} | ||
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// Handle the case where the head node needs to be removed | ||
while (head != null && valuesToRemove.contains(head.val)) { | ||
head = head.next; | ||
} | ||
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// If the list is empty after removing head nodes, return null | ||
if (head == null) { | ||
return null; | ||
} | ||
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// Iterate through the list, removing nodes with values in the set | ||
ListNode current = head; | ||
while (current.next != null) { | ||
if (valuesToRemove.contains(current.next.val)) { | ||
// Skip the next node by updating the pointer | ||
current.next = current.next.next; | ||
} else { | ||
// Move to the next node | ||
current = current.next; | ||
} | ||
} | ||
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return head; | ||
} | ||
} |