Day17_LEETCODE_1836. Remove Duplicates From an Unsorted Linked List.ipynb

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    "# Definition for singly-linked list.\n",
    "# class ListNode:\n",
    "#     def __init__(self, val=0, next=None):\n",
    "#         self.val = val\n",
    "#         self.next = next\n",
    "class Solution:\n",
    "    def deleteDuplicatesUnsorted(self, head: ListNode) -> ListNode:\n",
    "        dict={}\n",
    "        current=head\n",
    "        if head is None or head.next is None:\n",
    "            return head\n",
    "        else:\n",
    "            while current is not None:\n",
    "                if current.val in dict:\n",
    "                    dict[current.val] =   dict[current.val] +1           \n",
    "                else:\n",
    "                    dict[current.val] =1\n",
    "                current=current.next\n",
    "            dummy=ListNode(0)\n",
    "            dummy.next=head\n",
    "            current=dummy\n",
    "\n",
    "            while current.next is not None:\n",
    "                if dict[current.next.val] > 1:  # If the value is duplicated, skip it\n",
    "                    current.next = current.next.next\n",
    "                else:\n",
    "                    current = current.next\n",
    "        \n",
    "            return dummy.next \n",
    "\n"
   ]
  }
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