摘要：
题目： Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. You may assume the integer do not contain any le 阅读全文
摘要：
题目： You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note:You have to rotate the image in-place, wh 阅读全文