Class Solution

LeetCode_problems/first-bad-version/Solution.py:11–24

# Solution:(Approach 1)
class Solution:
    def firstBadVersion(self, n):
        """
        :type n: int
        :rtype: int
        """
        left,right=0,n
        while left < right:
            mid = left + (right - left) // 2
            if isBadVersion(mid):
                right = mid
            else:
                left = mid + 1
        return left