Commit 9ac50a9

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chore: Add new solution to LeetCode 203

Without using pre Node

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Original file line number	Diff line number	Diff line change
`@@ -234,6 +234,27 @@ public ListNode removeElements(ListNode head, int val) {`
`234`	`234`	`}`
`235`	`235`	`return head;`
`236`	`236`	`}`
	`237`	`+/**`
	`238`	`+ * 不添加虚拟节点and pre Node方式`
	`239`	`+ * 时间复杂度 O(n)`
	`240`	`+ * 空间复杂度 O(1)`
	`241`	`+ * @param head`
	`242`	`+ * @param val`
	`243`	`+ * @return`
	`244`	`+ */`
	`245`	`+public ListNode removeElements(ListNode head, int val) {`
	`246`	`+ while(head!=null && head.val==val){`
	`247`	`+ head = head.next;`
	`248`	`+ }`
	`249`	`+ ListNode curr = head;`
	`250`	`+ while(curr!=null){`
	`251`	`+ while(curr.next!=null && curr.next.val == val){`
	`252`	`+ curr.next = curr.next.next;`
	`253`	`+ }`
	`254`	`+ curr = curr.next;`
	`255`	`+ }`
	`256`	`+ return head;`
	`257`	`+}`
`237`	`258`	```
`238`	`259`
`239`	`260`	`Python:`

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