feat: 增加 9. 回文数

docs/.vitepress/config.ts

@@ -63,6 +63,7 @@ export default defineConfig({
           { text: '5. 最长回文子串', link: '/leetcode/longestPalindromicSubstring' },
           { text: '6. Z 字形变换', link: '/leetcode/zigzagConversion' },
           { text: '7. 整数反转', link: '/leetcode/reverseInteger' },
+          { text: '9. 回文数', link: '/leetcode/palindromeNumber' },
           { text: '83. 删除排序链表中的重复元素', link: '/leetcode/removeDuplicatesFromSortedList' },
           { text: '2085. 统计出现过一次的公共字符串', link: '/leetcode/countCommonWordsWithOneOccurrence' },
           { text: '2182. 构造限制重复的字符串', link: '/leetcode/constructStringWithRepeatLimit' },

docs/leetcode/palindromeNumber.md

@@ -0,0 +1,12 @@
+# 9. 回文数
+
+[9. 回文数](https://leetcode.cn/problems/palindrome-number/)
+
+## 代码
+
+::: code-group
+
+<<< ../../src/leetcode/palindromeNumber/javascript.js{javascript} [javascript]
+<<< ../../src/leetcode/palindromeNumber/typescript.ts{typescript} [typescript]
+
+:::

docs/leetcode/reverseInteger.md

@@ -9,4 +9,4 @@
 <<< ../../src/leetcode/reverseInteger/javascript.js{javascript} [javascript]
 <<< ../../src/leetcode/reverseInteger/typescript.ts{typescript} [typescript]
 
-:::
+:::

src/leetcode/palindromeNumber/javascript.js

@@ -0,0 +1,10 @@
+export function isPalindrome(x) {
+  if (x < 0) return false
+  let num = x
+  let res = 0
+  while (num !== 0) {
+    res = res * 10 + num % 10
+    num = ~~(num / 10)
+  }
+  return res === x
+}

src/leetcode/palindromeNumber/typescript.ts

@@ -0,0 +1,10 @@
+export function isPalindrome(x: number): boolean {
+  if (x < 0) return false
+  let num = x
+  let res = 0
+  while (num !== 0) {
+    res = res * 10 + num % 10
+    num = ~~(num / 10)
+  }
+  return res === x
+}

test/palindromeNumber.test.ts

@@ -0,0 +1,7 @@
+import { expect, test } from 'vitest'
+import { isPalindrome } from '../src/leetcode/palindromeNumber/typescript.ts'
+
+
+test(`121`, () => {
+  expect(isPalindrome(121)).toEqual(true)
+})

test/reverseInteger.test.ts

@@ -3,5 +3,5 @@ import { reverse } from '../src/leetcode/reverseInteger/typescript.ts'
 
 
 test(`123`, () => {
-  expect(reverse(123)).toEqual(321)
+  expect(reverse(123)).toBe(321)
 })