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Leetcode - Remove Duplicates from Sorted List II

Leetcode - Plus One Linked List

violet posted @ Aug 11, 2020 02:19:48 AM in 算法 with tags Algorithm java LinkedList , 10882 阅读

https://leetcode.com/problems/plus-one-linked-list/

Given a non-negative integer represented as non-empty a singly linked list of digits, plus one to the integer.

You may assume the integer do not contain any leading zero, except the number 0 itself.

The digits are stored such that the most significant digit is at the head of the list.

Example :

Input: [1,2,3]
Output: [1,2,4]

 

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode plusOne(ListNode head) {
        head = reverse(head);
        int carry = 1;
        ListNode node = head;
        ListNode prev = null;
        while(node != null) {
            int sum = node.val + carry;
            carry = 0;
            if (sum > 9) {
                carry = 1;
                sum -= 10;
            }
            node.val = sum;
            prev = node;
            node =  node.next;
        }
        if (carry == 1) {
            prev.next = new ListNode();
            prev.next.val = 1;
        }
        return reverse(head);
    }
    public ListNode reverse(ListNode head) {
        ListNode prev = null;
        ListNode node = head;
        while (node != null) {
            ListNode next = node.next;
            node.next = prev;
            prev = node;
            node = next;
        }
        return prev;
    }
}
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