leetcode: add two numbers problem
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# 2. Add Two Numbers (Medium)
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You are given two non-empty linked lists representing two non-negative integers.
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The digits are stored in reverse order, and each of their nodes contains a
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single digit. Add the two numbers and return the sum as a linked list.
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You may assume the two numbers do not contain any leading zero, except the
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number 0 itself.
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## Example 1:
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```
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Input: l1 = [2,4,3], l2 = [5,6,4]
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Output: [7,0,8]
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Explanation: 342 + 465 = 807.
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```
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## Example 2:
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```
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Input: l1 = [0], l2 = [0]
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Output: [0]
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```
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## Example 3:
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```
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Input: l1 = [9,9,9,9,9,9,9], l2 = [9,9,9,9]
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Output: [8,9,9,9,0,0,0,1]
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```
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## Constraints:
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- The number of nodes in each linked list is in the range [1, 100].
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- 0 <= Node.val <= 9
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- It is guaranteed that the list represents a number that does not have leading
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zeros.
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Binary file not shown.
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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 2,
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"id": "feab2236-6685-4f83-9d50-054bf952f66e",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"// Definition for singly-linked list.\n",
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"#[derive(PartialEq, Eq, Clone, Debug)]\n",
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"pub struct ListNode {\n",
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" pub val: i32,\n",
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" pub next: Option<Box<ListNode>>\n",
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"}\n",
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"\n",
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"impl ListNode {\n",
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" #[inline]\n",
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" fn new(val: i32) -> Self {\n",
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" ListNode {\n",
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" next: None,\n",
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" val\n",
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" }\n",
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" }\n",
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"}"
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]
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},
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{
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"cell_type": "markdown",
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"id": "65dd529b-49f6-4a98-b69d-12871b081a40",
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"metadata": {},
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"source": [
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"# Idea 1: O(n + m)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 19,
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"id": "167e31a3-7844-4cdf-a563-241a40b07212",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"pub fn internal_add_two_numbers(extra_val: i32, l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {\n",
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" match (extra_val, l1.clone(), l2.clone()) {\n",
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" (0, None, None) => None,\n",
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" (_, l1, l2) => {\n",
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" let val =\n",
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" l1.as_ref().map(|n1| n1.val).unwrap_or_default()\n",
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" + l2.as_ref().map(|n2| n2.val).unwrap_or_default()\n",
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" + extra_val;\n",
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" let mut nn = ListNode::new(val % 10);\n",
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" let extra_val = if val > 9 { 1 } else { 0 };\n",
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" nn.next = internal_add_two_numbers(\n",
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" extra_val,\n",
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" l1.and_then(|n1| n1.next),\n",
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" l2.and_then(|n2| n2.next)\n",
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" );\n",
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" Some(Box::new(nn))\n",
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" }\n",
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" }\n",
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"}\n",
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"\n",
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"pub fn add_two_numbers(l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {\n",
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" internal_add_two_numbers(0, l1, l2)\n",
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"}"
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]
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},
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{
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"cell_type": "markdown",
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"id": "f9dab3ca-0d78-4050-b94b-ad0d19348b09",
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"metadata": {},
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"source": [
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"# Test Utils"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 17,
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"id": "33f9c78d-98f5-4d95-9ed0-e0c1961dc7b6",
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"metadata": {
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"tags": []
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},
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"outputs": [
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{
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"ename": "Error",
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"evalue": "duplicate definitions with name `with_next`",
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"output_type": "error",
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"traceback": [
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"\u001b[31m[E0592] Error:\u001b[0m duplicate definitions with name `with_next`",
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" \u001b[38;5;246m╭\u001b[0m\u001b[38;5;246m─\u001b[0m\u001b[38;5;246m[\u001b[0mcommand_17:1:1\u001b[38;5;246m]\u001b[0m",
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" \u001b[38;5;246m│\u001b[0m",
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" \u001b[38;5;246m3 │\u001b[0m \u001b[38;5;249m \u001b[0m\u001b[38;5;249m \u001b[0m\u001b[38;5;249m \u001b[0m\u001b[38;5;249m \u001b[0m\u001b[38;5;54mf\u001b[0m\u001b[38;5;54mn\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54mw\u001b[0m\u001b[38;5;54mi\u001b[0m\u001b[38;5;54mt\u001b[0m\u001b[38;5;54mh\u001b[0m\u001b[38;5;54m_\u001b[0m\u001b[38;5;54mn\u001b[0m\u001b[38;5;54me\u001b[0m\u001b[38;5;54mx\u001b[0m\u001b[38;5;54mt\u001b[0m\u001b[38;5;54m(\u001b[0m\u001b[38;5;54mv\u001b[0m\u001b[38;5;54ma\u001b[0m\u001b[38;5;54ml\u001b[0m\u001b[38;5;54m:\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54mi\u001b[0m\u001b[38;5;54m3\u001b[0m\u001b[38;5;54m2\u001b[0m\u001b[38;5;54m,\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54mn\u001b[0m\u001b[38;5;54me\u001b[0m\u001b[38;5;54mx\u001b[0m\u001b[38;5;54mt\u001b[0m\u001b[38;5;54m:\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54mL\u001b[0m\u001b[38;5;54mi\u001b[0m\u001b[38;5;54ms\u001b[0m\u001b[38;5;54mt\u001b[0m\u001b[38;5;54mN\u001b[0m\u001b[38;5;54mo\u001b[0m\u001b[38;5;54md\u001b[0m\u001b[38;5;54me\u001b[0m\u001b[38;5;54m)\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54m-\u001b[0m\u001b[38;5;54m>\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54mS\u001b[0m\u001b[38;5;54me\u001b[0m\u001b[38;5;54ml\u001b[0m\u001b[38;5;54mf\u001b[0m\u001b[38;5;249m \u001b[0m\u001b[38;5;249m{\u001b[0m",
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" \u001b[38;5;246m ·\u001b[0m \u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m┬\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m ",
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" \u001b[38;5;246m ·\u001b[0m \u001b[38;5;54m╰\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m other definition for `with_next`",
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"\u001b[38;5;246m───╯\u001b[0m"
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]
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},
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{
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"ename": "Error",
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"evalue": "duplicate definitions with name `fromVec`",
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"output_type": "error",
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"traceback": [
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"\u001b[31m[E0592] Error:\u001b[0m duplicate definitions with name `fromVec`",
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" \u001b[38;5;246m╭\u001b[0m\u001b[38;5;246m─\u001b[0m\u001b[38;5;246m[\u001b[0mcommand_17:1:1\u001b[38;5;246m]\u001b[0m",
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" \u001b[38;5;246m│\u001b[0m",
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" \u001b[38;5;246m10 │\u001b[0m \u001b[38;5;249m \u001b[0m\u001b[38;5;249m \u001b[0m\u001b[38;5;249m \u001b[0m\u001b[38;5;249m \u001b[0m\u001b[38;5;54mf\u001b[0m\u001b[38;5;54mn\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54mf\u001b[0m\u001b[38;5;54mr\u001b[0m\u001b[38;5;54mo\u001b[0m\u001b[38;5;54mm\u001b[0m\u001b[38;5;54mV\u001b[0m\u001b[38;5;54me\u001b[0m\u001b[38;5;54mc\u001b[0m\u001b[38;5;54m(\u001b[0m\u001b[38;5;54mv\u001b[0m\u001b[38;5;54m:\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54mV\u001b[0m\u001b[38;5;54me\u001b[0m\u001b[38;5;54mc\u001b[0m\u001b[38;5;54m<\u001b[0m\u001b[38;5;54mi\u001b[0m\u001b[38;5;54m3\u001b[0m\u001b[38;5;54m2\u001b[0m\u001b[38;5;54m>\u001b[0m\u001b[38;5;54m)\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54m-\u001b[0m\u001b[38;5;54m>\u001b[0m\u001b[38;5;54m \u001b[0m\u001b[38;5;54mO\u001b[0m\u001b[38;5;54mp\u001b[0m\u001b[38;5;54mt\u001b[0m\u001b[38;5;54mi\u001b[0m\u001b[38;5;54mo\u001b[0m\u001b[38;5;54mn\u001b[0m\u001b[38;5;54m<\u001b[0m\u001b[38;5;54mB\u001b[0m\u001b[38;5;54mo\u001b[0m\u001b[38;5;54mx\u001b[0m\u001b[38;5;54m<\u001b[0m\u001b[38;5;54mS\u001b[0m\u001b[38;5;54me\u001b[0m\u001b[38;5;54ml\u001b[0m\u001b[38;5;54mf\u001b[0m\u001b[38;5;54m>\u001b[0m\u001b[38;5;54m>\u001b[0m\u001b[38;5;249m \u001b[0m\u001b[38;5;249m{\u001b[0m",
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" \u001b[38;5;246m ·\u001b[0m \u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m┬\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m ",
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" \u001b[38;5;246m ·\u001b[0m \u001b[38;5;54m╰\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m\u001b[38;5;54m─\u001b[0m other definition for `fromVec`",
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"\u001b[38;5;246m────╯\u001b[0m"
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]
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}
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],
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"source": [
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"impl ListNode {\n",
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" #[inline]\n",
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" fn with_next(val: i32, next: ListNode) -> Self {\n",
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" ListNode {\n",
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" next: Some(Box::new(next)),\n",
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" val,\n",
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" }\n",
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" }\n",
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" \n",
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" fn fromVec(v: Vec<i32>) -> Option<Box<Self>> {\n",
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" v.into_iter()\n",
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" .rev()\n",
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" .fold(None, |acc, val| {\n",
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" match acc {\n",
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" None => Some(Box::new(ListNode::new(val))),\n",
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" Some(node) => Some(Box::new(ListNode::with_next(val, *node)))\n",
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" }\n",
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" })\n",
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" }\n",
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"}\n",
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"\n",
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"assert_eq!(\n",
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" ListNode::fromVec(vec![7, 0, 8]),\n",
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" Some(Box::new(ListNode::with_next(7, ListNode::with_next(0, ListNode::new(8)))))\n",
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");"
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]
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},
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{
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"cell_type": "markdown",
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"id": "69eca992-8fc9-4507-b636-d64b5561be21",
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"metadata": {},
|
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"source": [
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"# Test Cases"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 18,
|
||||
"id": "30adc3ca-7327-4336-b294-3e8fd3380c01",
|
||||
"metadata": {
|
||||
"tags": []
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"assert_eq!(\n",
|
||||
" add_two_numbers(\n",
|
||||
" ListNode::fromVec(vec![2,4,3]),\n",
|
||||
" ListNode::fromVec(vec![5,6,4])\n",
|
||||
" ),\n",
|
||||
" ListNode::fromVec(vec![7,0,8])\n",
|
||||
");\n",
|
||||
"assert_eq!(\n",
|
||||
" add_two_numbers(\n",
|
||||
" ListNode::fromVec(vec![0]),\n",
|
||||
" ListNode::fromVec(vec![0])\n",
|
||||
" ),\n",
|
||||
" ListNode::fromVec(vec![0])\n",
|
||||
");\n",
|
||||
"\n",
|
||||
"assert_eq!(\n",
|
||||
" add_two_numbers(\n",
|
||||
" ListNode::fromVec(vec![9,9]),\n",
|
||||
" ListNode::fromVec(vec![9])\n",
|
||||
" ),\n",
|
||||
" ListNode::fromVec(vec![8,0,1])\n",
|
||||
");\n",
|
||||
"assert_eq!(\n",
|
||||
" add_two_numbers(\n",
|
||||
" ListNode::fromVec(vec![9,9,9,9,9,9,9]),\n",
|
||||
" ListNode::fromVec(vec![9,9,9,9])\n",
|
||||
" ),\n",
|
||||
" ListNode::fromVec(vec![8,9,9,9,0,0,0,1])\n",
|
||||
");"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": null,
|
||||
"id": "9377916a-51fc-4534-b53e-ec9ac5e3c81e",
|
||||
"metadata": {},
|
||||
"outputs": [],
|
||||
"source": []
|
||||
}
|
||||
],
|
||||
"metadata": {
|
||||
"kernelspec": {
|
||||
"display_name": "rust-Rust kernel",
|
||||
"language": "rust",
|
||||
"name": "rust-rust"
|
||||
},
|
||||
"language_info": {
|
||||
"codemirror_mode": "rust",
|
||||
"file_extension": ".rs",
|
||||
"mimetype": "text/rust",
|
||||
"name": "Rust",
|
||||
"pygment_lexer": "rust",
|
||||
"version": ""
|
||||
}
|
||||
},
|
||||
"nbformat": 4,
|
||||
"nbformat_minor": 5
|
||||
}
|
||||
Loading…
Reference in New Issue