我的代码 for Leetcode(在Lintcode中因为isBadVersion调用太多次无法通过)

# The isBadVersion API is already defined for you.# @param version, an integer# @return a bool# def isBadVersion(version):class Solution:    def firstBadVersion(self, n):        """        :type n: int        :rtype: int        """        if isBadVersion(1) is True:            return 1        else:            if n==1:                return 0        l = 2        r = n        m = (l+r)//2        while(l<=r):            print(l,m,r)            t1 = isBadVersion(m-1)            t2 = isBadVersion(m)            print(t1,t2)            if t1 is False and t2 is True:                print("ok")                return m            else:                if t2 is False:                    l = m+1                else:                    if t1 is True:                        r = m-1            m = (l+r)//2

别人的代码 for Lintcode

#class SVNRepo:#    @classmethod#    def isBadVersion(cls, id)#        # Run unit tests to check whether verison `id` is a bad version#        # return true if unit tests passed else false.# You can use SVNRepo.isBadVersion(10) to check whether version 10 is a # bad version.class Solution:    """    @param n: An integer    @return: An integer which is the first bad version.    """    def findFirstBadVersion(self, n):        # write your code here        r = n-1        l = 0        while(l<=r):            mid = l + (r-l)//2            if SVNRepo.isBadVersion(mid)==False:                l = mid+1            else:                r = mid-1        return l