LetCode in Swift (657-Judge Route Circle)
文档更新说明
- 最后更新 2018年03月08日
- 首次更新 2018年03月08日
前言
使用Swift语言完成LetCode题目,简单难度
771. Jewels and Stones
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.
Example1
Input: "UD"
Output: true
Example2
Input: "LL"
Output: false
Note
太简单了没有提示……
Solution
1 | import Foundation |