LC 0246 [E] Strobogrammatic Number - ALawliet/algorithms GitHub Wiki
class Solution:
def isStrobogrammatic(self, s: str) -> bool:
if not s:
return False
pairs = set([('0','0'), ('1','1'), ('6','9'), ('8','8'), ('9','6')])
l, r = 0, len(s) - 1
while l <= r:
if (s[l], s[r]) not in pairs:
return False
l += 1 ; r -= 1
return True