ListNode next) { this.val = val; this.next = next; }9* }10*/11classSolution {12publicListNode deleteDuplicatesUnsorted(ListNode head) {13//HashMap<Integer, Integer> map = new HashMap<>
Given theheadof a linked list, find all the values that appear more than once in the list and delete the nodes that have any of those values. Returnthe linked list after the deletions. Example 1: Input: head = [1,2,3,2] Output: [1,3] Explanation: 2 appears twice in the linked ...
We need a data structure to keep track of the characters we have seen so far, which can perform efficient find operation. If the input is guaranteed to be in standard ASCII form, we can just create a boolean array of size 128 and perform lookups by accessing the index of the character’...
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