摘要：
Given a string s consists of upper/lower case alphabets and empty space characters , return the length of last word in the string. If the last word do 阅读全文
摘要：
知道啥是 gray code 就是收获了． 下面介绍了 gray code 发明的 motivation, 了解动机后就知道啥是 gray code 了． https://zh.wikipedia.org/wiki/格雷码 阅读全文
摘要：
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, 阅读全文