如何打印出数组中最常用的所有元素

def print_most_common_elements(arr):
    # 创建一个空字典
    count_dict = {}

    # 统计数组中每个元素的出现次数
    for element in arr:
        if element in count_dict:
            count_dict[element] += 1
        else:
            count_dict[element] = 1

    # 找到出现次数最多的值
    max_count = max(count_dict.values())

    # 打印出现次数最多的元素
    for element, count in count_dict.items():
        if count == max_count:
            print(element)

# 测试代码
arr = [1, 2, 3, 2, 4, 3, 2, 1, 5, 1]
print_most_common_elements(arr)

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