问题链接
解题思路
利用while循环，左右取均值，进行二分查找：
1、遇到isBadVersion右边界取中值
2、没有遇到则左边界为中值+1
3、最终返回左边界
代码
# 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
"""
start = 1
end = n
while start < end:
mid = (start + end) / 2
if isBadVersion(mid):
end = mid
else:
start = mid + 1
return start
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