80 lines
1.4 KiB
Markdown
80 lines
1.4 KiB
Markdown
|
# Leetcode Add-Two-Numbers
|
|||
|
|
|
|||
|
|
2022-09-08 15:22
|
|||
|
|
|
|||
|
|
> ##### Algorithms:
|
|||
|
|
>
|
|||
|
|
> #algorithm #math
|
|||
|
|
>
|
|||
|
|
> ##### Data structures:
|
|||
|
|
>
|
|||
|
|
> #DS #linked_list
|
|||
|
|
>
|
|||
|
|
> ##### Difficulty:
|
|||
|
|
>
|
|||
|
|
> #coding_problem #difficulty_medium
|
|||
|
|
>
|
|||
|
|
> ##### Additional tags:
|
|||
|
|
>
|
|||
|
|
> #leetcode
|
|||
|
|
>
|
|||
|
|
> ##### Revisions:
|
|||
|
|
>
|
|||
|
|
> N/A
|
|||
|
|
|
|||
|
|
##### Links:
|
|||
|
|
|
|||
|
|
- [Link to problem](https://leetcode.com/problems/add-two-numbers/)
|
|||
|
|
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
### Problem
|
|||
|
|
|
|||
|
|
You are given two **non-empty** linked lists representing two non-negative integers. The digits are stored in **reverse order**, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list.
|
|||
|
|
|
|||
|
|
You may assume the two numbers do not contain any leading zero, except the number 0 itself.
|
|||
|
|
|
|||
|
|
#### Examples
|
|||
|
|
|
|||
|
|
**Example 1:**
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
**Input:** l1 = [2,4,3], l2 = [5,6,4]
|
|||
|
|
**Output:** [7,0,8]
|
|||
|
|
**Explanation:** 342 + 465 = 807.
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
**Example 2:**
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
**Input:** l1 = [0], l2 = [0]
|
|||
|
|
**Output:** [0]
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
**Example 3:**
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
**Input:** l1 = [9,9,9,9,9,9,9], l2 = [9,9,9,9]
|
|||
|
|
**Output:** [8,9,9,9,0,0,0,1]
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
#### Constraints
|
|||
|
|
|
|||
|
|
- The number of nodes in each linked list is in the range `[1, 100]`.
|
|||
|
|
- `0 <= Node.val <= 9`
|
|||
|
|
- It is guaranteed that the list represents a number that does not have leading zeros.
|
|||
|
|
|
|||
|
|
### Thoughts
|
|||
|
|
|
|||
|
|
> [!summary]
|
|||
|
|
> This is a elementary #math problem.
|
|||
|
|
> For a list of similar questions, visit [[Elementary Math Problems]]
|
|||
|
|
|
|||
|
|
Done by using elementary math.
|
|||
|
|
|
|||
|
|
Use only one
|
|||
|
|
|
|||
|
|
### Solution
|