找出两个列表中每个元素之间的最大差值

def find_max_difference(list1, list2):
    merged_list = list1 + list2
    merged_list.sort()
    
    max_difference = 0
    for i in range(len(merged_list) - 1):
        difference = merged_list[i+1] - merged_list[i]
        if difference > max_difference:
            max_difference = difference
    
    return max_difference

# 示例用法
list1 = [1, 5, 9]
list2 = [3, 8, 12]
result = find_max_difference(list1, list2)
print("最大差值为:", result)