## 题目描述：

LeetCode 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 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
```

## Python代码：

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

## Python代码：

``````class Solution(object):
def judgeCircle(self, moves):
"""
:type moves: str
:rtype: bool
"""
return moves.count('L') == moves.count('R') and \
moves.count('U') == moves.count('D')
``````

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