题目：原题链接（中等）
标签：数学、几何
解法 | 时间复杂度 | 空间复杂度 | 执行用时 |
Ans 1 (Python) | O ( N ) | O ( 1 ) | 40ms (58.27%) |
Ans 2 (Python) | |||
Ans 3 (Python) |
解法一：
class Solution:
def isRobotBounded(self, instructions: str) -> bool:
x, y, d = 0, 0, 0
direction = [(0, 1), (1, 0), (0, -1), (-1, 0)]
for ch in instructions * 4:
if ch == "L":
d = (d - 1) % 4
elif ch == "R":
d = (d + 1) % 4
else:
x += direction[d][0]
y += direction[d][1]
return x == 0 and y == 0
