leetcode-easy-sorting and searching- 278 First Bad Version

mycode  96.42

# The isBadVersion API is already defined for you.
# @param version, an integer
# @return a bool
# def isBadVersion(version):

class Solution(object):
    def firstBadVersion(self, n):
        """
        :type n: int
        :rtype: int
        """
        l , r = 1 , n
        while l < r:
            mid = (l + r)//2
            if isBadVersion(mid):
                r = mid
            else:
                l = mid + 1
        return l

 

参考

# The isBadVersion API is already defined for you.
# @param version, an integer
# @return a bool
# def isBadVersion(version):

class Solution(object):
    def firstBadVersion(self, n):
        """
        :type n: int
        :rtype: int
        """
        
        l, r = 1, n
        
        while l <= r:
            mid = (l + r) // 2
            if isBadVersion(mid):
                r = mid - 1
            else:
                l = mid + 1
        return l