# 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

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]
```

```/**
* 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 {
int carry = 1;
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;
}
}
ListNode prev = null;
while (node != null) {
ListNode next = node.next;
node.next = prev;
prev = node;
node = next;
}
return prev;
}
}```
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