LC 0278 [E] First Bad Version - ALawliet/algorithms GitHub Wiki

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class Solution:
    def firstBadVersion(self, n):
        l = 0
        r = n
        while l < r:
            m = (l + r) // 2
            if not isBadVersion(m):
                l = m + 1
            else:
                r = m
        return l