here is a robot starting at position (0, 0), the origin, on a 2D plane. Given a sequence of its moves, judge if this robot ends up at (0, 0) after it completes its moves.

The move sequence is represented by a string, and the character moves[i] represents its ith move. Valid moves are R (right), L (left), U (up), and D (down). If the robot returns to the origin after it finishes all of its moves, return true. Otherwise, return false.

Note: The way that the robot is "facing" is irrelevant. "R" will always make the robot move to the right once, "L" will always make it move left, etc. Also, assume that the magnitude of the robot's movement is the same for each move.

Example 1:

Input: "UD"
Output: true
Explanation: The robot moves up once, and then down once. All moves have the same magnitude, so it ended up at the origin where it started. Therefore, we return true.

Example 2:

Input: "LL"
Output: false
Explanation: The robot moves left twice. It ends up two "moves" to the left of the origin. We return false because it is not at the origin at the end of its moves.

解:今天的題目比較簡單, 我的想法就有點像C++的case.RL只會在x軸上下跟UD會在y軸上下,只有把輸入的字串一個一個對應到"R""U""L""D". 最後x y 答案都是0,就回傳true 否則就回false

class Solution:
def judgeCircle(self, moves):
"""
:type moves: str
:rtype: bool
"""
x = 0
y = 0
for i in moves:
if(i=="R"):
x=x+1
elif(i=="U"):
y=y+1
elif(i=="L"):
x=x-1
elif(i=="D"):
y=y-1

    if(x==0 and y==0):
        return True
    else:
        return False