【657.|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.
Input: "UD"
Output: true
python的办法
c = collections.Counter(moves)
return c['L'] == c['R'] and c['U'] == c['D']
傻了吧唧的办法
def judgeCircle(self, moves):
"""
:type moves: str
:rtype: bool
"""
fre = 0
dir = {'R':0,'L':0,'U':0,'D':0}
for i in moves:
if i in dir.keys():
dir[i] += 1
if dir['R'] == dir['L'] and dir['U'] == dir['D']:
return True
else:
return False
