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Reverse digits of an integer.Example1: x = 123, return 321 Example2: x = -123, return -321click to show spoilers.Have you thought about this? Here are some good questions to ask before coding. Bonus

Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases.N

Determine whether an integer is a palindrome. Do this without extra space.判断一个int数是否是回文？ 解法：转换为字符串， 字符串判断回文很简单for (int i = 0, j = s.size() - 1; i != s.size() / 2; i++, j--){ if (s[i] != s[j]) re