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https://leetcode.com/problems/palindrome-number문제Given 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..

https://leetcode.com/problems/two-sum/문제Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.You may assume that each input would have exactly one solution, and you may not use the same element twice.You can return the answer in any order.Example 1:Input: nums = [2,7,11,15], target = 9 Output: [0,1] Explanation: Because nums[0] ..