牛客网 旋转数组的最小值

class Solution:
    def minNumberInRotateArray(self, rotateArray):
        # write code here
        pre = -7e20
        for num in rotateArray:
            if num < pre:
                return num
            pre = num

        if len(rotateArray) == 0:
            return 0
        return rotateArray[0]

    # 二分的思路
    def minNumberInRotateArray2(self, rotateArray):
        low=0
        high=len(rotateArray)-1
        mid=0
        while low<high:
            if low==high-1:
                break
            if rotateArray[low]<rotateArray[high]:
                return rotateArray[low]
            mid=(low+high)//2
            if(rotateArray[low]>rotateArray[mid]):
                high=mid
                continue
            if rotateArray[mid]>rotateArray[high]:
                low=mid
                continue
            while low<mid:
                if rotateArray[low]==rotateArray[mid]:
                    low+=1
                elif rotateArray[low]<rotateArray[mid]:
                    return rotateArray[low]
                else:
                    high=mid
                    break
        return min(rotateArray[low],rotateArray[high])