数字在二维数组中出现的次数

def count_number_in_2d_array(array, target):
    count = 0
    for row in array:
        for element in row:
            if element == target:
                count += 1
    return count

# 示例二维数组
example_array = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

# 查找数字 5 出现的次数
result = count_number_in_2d_array(example_array, 5)
print(f"数字 5 出现的次数: {result}")

def safe_count_number_in_2d_array(array, target):
    count = 0
    for i in range(len(array)):
        for j in range(len(array[i])):
            if array[i][j] == target:
                count += 1
    return count

def robust_count_number_in_2d_array(array, target):
    if not array or not all(len(row) == len(array[0]) for row in array):
        return 0
    count = 0
    for row in array:
        for element in row:
            if element == target:
                count += 1
    return count