LeetCode 203: Remove Linked List Elements Solution
Master LeetCode problem 203 (Remove Linked List Elements), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
203. Remove Linked List Elements
Problem Explanation
Explanation
To solve this problem, we can iterate through the linked list while checking if the current node's value matches the given value val. If it does, we skip that node by adjusting the pointers. We continue this process until we reach the end of the linked list. We need to handle the cases where the head node itself needs to be removed, in which case we move the head pointer to the next node.
- Time complexity: O(N), where N is the number of nodes in the linked list.
- Space complexity: O(1)
Solution Code
class Solution {
public ListNode removeElements(ListNode head, int val) {
while (head != null && head.val == val) {
head = head.next;
}
ListNode current = head;
while (current != null && current.next != null) {
if (current.next.val == val) {
current.next = current.next.next;
} else {
current = current.next;
}
}
return head;
}
}Try It Yourself
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