perfect_square
perfect_square.py 源码
# 有效的完全平方数
class Solution:
def isPerfectSquare(self, num: int) -> bool:
low, high = 1, num
while low <= high:
mid = (low + high) // 2
if mid * mid < num:
low = mid + 1
elif mid * mid > num:
high = mid - 1
else:
return True
return False
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