LEETCODEEasy
Palindrome Number
Given an integer x, return true if x is a palindrome, and false otherwise.
Example 1:
Input: x = 121 Output: true Explanation: 121 reads as 121 from left to right and from right to left.
Example 2:
Input: x = -121 Output: false Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
Example 3:
Input: x = 10 Output: false Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
Constraints:
-231 <= x <= 231 - 1
Follow up: Could you solve it without converting the integer to a string?
풀이 TypeScript
function isPalindrome(x: number): boolean {
if(x < 0) return false;
const str = x.toString();
const length = str.length;
const midIndex = Math.floor(length / 2) + length % 2;
const prev = str.slice(0, midIndex - length % 2);
const post = str.slice(midIndex)
return prev.split('').reverse().join('') === post;
};복사됨