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    class Solution(object):
        def isPerfectSquare(self, num):
            """
            :type num: int
            :rtype: bool
            """
            left = 0; right = num
            while left <= right:
                mid = (left+right)/2
                if mid**2 == num:
                    return True
                elif mid**2 > num:
                    right = mid-1
                else:
                    left = mid+1
            return False

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