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Insert Node in Sorted Linked List

ID: 219; easy; 在排序链表中插入一个节点

Solution 1 (Java)

/**
* Definition for ListNode
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) {
* val = x;
* next = null;
* }
* }
*/
public class Solution {
/**
* @param head: The head of linked list.
* @param val: An integer.
* @return: The head of new linked list.
*/
public ListNode insertNode(ListNode head, int val) {
ListNode dummy = new ListNode(0);
dummy.next = head;
ListNode cur = dummy;
while (cur.next != null && cur.next.val <= val) {
cur = cur.next;
}
ListNode newNode = new ListNode(val);
newNode.next = cur.next;
cur.next = newNode;
return dummy.next;
}
}

Notes

  • Find the first node in the list after which the new node should be inserted.