Merge Two Sorted Lists
Difficulty: EasyTopic: Linked ListRecursionLeetcode:21.Merge Two Sorted ListsYou are given the heads of two sorted linked lists list1 and list2.
Merge the two lists into one sorted list. The list should be made by splicing together the nodes of the first two lists.
Return the head of the merged linked list.
Example 1:
Input: list1 = [1,2,4], list2 = [1,3,4]
Output: [1,1,2,3,4,4]
Example 2:
Input: list1 = [], list2 = []
Output: []
Example 3:
Input: list1 = [], list2 = [0]
Output: [0]
Constraints:
- The number of nodes in both lists is in the range
[0, 50]. -100 <= Node.val <= 100- Both
list1andlist2are sorted in non-decreasing order.
Solution
write solution in here
/**
* @param {ListNode} list1
* @param {ListNode} list2
* @return {ListNode}
*/
var mergeTwoLists = function (list1, list2) {
let node = new ListNode(null),
p = node
while (list1 && list2) {
if (list1.val <= list2.val) {
p.next = list1;
list1 = list1.next;
} else {
p.next = list2;
list2 = list2.next
}
p = p.next
}
if (list1) {
p.next = list1
}
if (list2) {
p.next = list2
}
return node.next
};