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Merge pull requestneetcode-gh#1962 from laitooo/0021-merge-two-sorted-lists.dart

Create: 0021-Merge-Two-Sorted-Lists.dart

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	`1`	`+/**`
	`2`	`+ * Definition for singly-linked list.`
	`3`	`+ * class ListNode {`
	`4`	`+ * int val;`
	`5`	`+ * ListNode? next;`
	`6`	`+ * ListNode([this.val = 0, this.next]);`
	`7`	`+ * }`
	`8`	`+ */`
	`9`	`+classSolution {`
	`10`	`+ListNode?mergeTwoLists(ListNode? list1,ListNode? list2) {`
	`11`	`+ListNode? head=ListNode();`
	`12`	`+ListNode? cur= head;`
	`13`	`+while (list1!=null&& list2!=null) {`
	`14`	`+if (list1!.val< list2!.val) {`
	`15`	`+ cur!.next= list1;`
	`16`	`+ list1= list1!.next;`
	`17`	`+ }else {`
	`18`	`+ cur!.next= list2;`
	`19`	`+ list2= list2!.next;`
	`20`	`+ }`
	`21`	`+ cur= cur!.next;`
	`22`	`+ }`
	`23`	`+ cur!.next= (list1==null)? list2: list1;`
	`24`	`+return head.next;`
	`25`	`+ }`
	`26`	`+}`

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