直接搜索,可以ac,后续再探索时间复杂度更小的方案

class Solution:
    def Find(self , target: int, array: List[List[int]]) -> bool:
        # write code here
        m, n = len(array), len(array[0]) # 计算数组行数和列数
        for i in range(m):
            for j in range(n):
                if array[i][j] == target:
                    return True
        return False