Royal LINKING红黑色系WEB2.O模板,网站模板
上传时间： 2017-04-21
上传用户：皇族传媒
The government of a small but important country has decided that the alphabet needs to be streamlined and reordered. Uppercase letters will be eliminated. They will issue a Royal decree in the form of a String of B and A characters. The first character in the decree specifies whether a must come ( B )Before b in the new alphabet or ( A )After b . The second character determines the relative placement of b and c , etc. So, for example, "BAA" means that a must come Before b , b must come After c , and c must come After d . Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet. Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1. Definition
标签： government streamline important alphabet
上传时间： 2015-06-08
上传用户：weixiao99
这是一本从小学一年级到博士班必备的工具书！ 《一生受用的公式》将人类千年以来所发展的标准数学、物理公式重新汇编，再赋予崭新风貌，既是入门手册，是备忘录，也是参考书。它搜集了关于面积、体积、平面与球体几何的公式；齿轮与滑轮、重力、基本力学、透镜、电磁、流体、气体方程式；还有排列组合、统计、微积分及高维空间公式。此外，重要名词简介、数学物理常数与公制单位转换表，也都在附录中详列。 全书贯穿以迷人的插图，内容之丰富，令人难以想象这是出自于两位音乐家之手，值得细细玩味与收藏。 作者沃特金斯(Matthew Watkins) 英国人，身兼音乐家和数学家。在完成一项英国皇家学会（Royal Society）赞助的研究计划后，他买了一头驴子，远离尘嚣，现在过着近乎游牧民族的生活方式。
上传时间： 2014-01-24
上传用户：xauthu
