657. Judge Route Circle

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 tothe original place.

The move sequence is represented by a string. And each move is represent by a character. The valid robot moves areR(Right),L(Left),U(Up) andD(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

Code

class Solution(object):
    def judgeCircle(self, moves):
        """
        :type moves: str
        :rtype: bool
        """
        if (len(moves) %2 != 0):
            return false
        L = R = U = D = 0
        for char in moves:
            if char== 'L':
                L+=1
            if char== 'R':
                R+=1
            if char== 'U':
                U+=1
            if char== 'D':
                D+=1

        if (L == R and U == D): 
            return True
        return False