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Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue. Here, we will use the integers

做leetcode的一道关于螺旋矩阵的题目：Spiral Matrix II 顺道看了一下螺旋矩阵的问题： 先看leetcode题目： Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example, Given n = 3,

121. Best Time to Buy and Sell Stock Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (