657. 机器人能否返回原点

https://leetcode-cn.com/problems/robot-return-to-origin/

解法一：

用两个计数器（水平、垂直）分别计算上下和左右方向的移动步数，初始都为0，若能回归初始状态，则说明返回原点

class Solution:
    def judgeCircle(self, moves: str) -> bool:
        vertical = 0  #垂直方向
        horizontal = 0  #水平
        for move in moves:
            if move == 'R':
                horizontal += 1
            if move == 'L':
                horizontal -= 1
            if move == 'U':
                vertical += 1
            if move == 'D':
                vertical -= 1
        return vertical == 0 and horizontal == 0