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Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid. The brackets must close in the correct order, “()” and “()[]{}” are all valid but

题目：Determine whether an integer is a palindrome. Do this without extra space.思路：开始想通过整数除法和取余数运算依次比较首尾是否相同，后来发现中间有0时很难比较。比如3005003 然后发现了一个神奇的东西，切片 666 一行代码搞定 如果我们把python里面的list比作一大块猪肉，那么list里面每一个元素，