R4-二分查找专题
直接二维变一维，然后二分查找就可以了
class Solution:def searchMatrix(self, matrix: List[List[int]], target: int) -> bool:nums=[i for row in matrix for i in row]def binfind(the,target):low,high=0,len(the)-1while low<=high:mid=(low+high)//2if the[mid]==target:return Trueelif the[mid]>target:high=mid-1else:low=mid+1return Falsereturn binfind(nums,target) 
