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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数学与生活（修订版）
[日] 远山启 / 吕砚山、李诵雪、马杰、莫德举 / 人民邮电出版社 / 2014-10 / 42.00元
数学是高等智慧生物的共有思维，是对真理的探索，对矛盾的怀疑，但它绝非一门晦涩难懂的学问，非应试目的的数学是纯粹而朴实的智慧。《数学与生活》为日本数学教育改革之作，旨在还原被考试扭曲的数学，为读者呈现数学的真正容颜，消除应试教学模式带来的数学恐惧感。 本书既包含了初等数学的基础内容，又包含了微分、积分、微分方程、费马定理、欧拉公式等高等数学的内容。作者运用了多个学科的知识。结合日常生活和东西方......一起来看看 《数学与生活（修订版）》 这本书的介绍吧!
