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题目：判断一个数是不是回文数Determine whether an integer is a palindrome. Do this without extra space.思路：借助上一道求整数逆序的思路，判断逆序后的数和原数是否相等就行。要注意，负数都不是回文数11506 / 11506 te... 阅读全文
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题目：Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321思路：递归解答：1032 / 1032 test cases passed.Status: AcceptedRunt... 阅读全文
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题目：The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed fo... 阅读全文