内容简介：Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the original place.The move sequence is represented by a string. And each move is represent by a character. The
Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the original place.
The move sequence is represented by a string. And each move is represent by a character. The valid robot moves are R (Right), L (Left), U (Up) and D (down). The output should be true or false representing whether the robot makes a circle.
Example 1:
Input: “UD”
Output: true
Example 2:
Input: “LL”
Output: false
return moves.filter({$0 == "U"}).count == moves.filter({$0 == "D"}).count && moves.filter({$0 == "R"}).count == moves.filter({$0 == "L"}).count
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高性能HTML5
Jay Bryant、Mike Jones / 奇舞团 / 电子工业出版社 / 2014-5
《高性能html5》为读者讲解了如何用html5 从一开始就设计一个高性能的网站，以及如何对已有网站进行改良，使得它们具备优越的性能。《高性能html5》中总结了许多实践经验、关键技巧，并提供了丰富的示例，作者有意无意地将软件工程以及前端开发技术之道隐藏于朴实的描述中。 通过学习《高性能html5》，读者能够掌握如何创建自己的高性能网站。《高性能html5》适合于想创建自己网站的初学者，同样......一起来看看 《高性能HTML5》 这本书的介绍吧!
