以下是一个示例代码，可以将数组分组显示到按键上：

def group_display(arr):
    groups = {}

    for i, num in enumerate(arr):
        if num not in groups:
            groups[num] = [i]
        else:
            groups[num].append(i)

    for num, indices in groups.items():
        print(f"Number {num} is found at indices: {', '.join(map(str, indices))}")

# 示例输入
arr = [1, 2, 3, 1, 4, 2, 5, 3, 1, 2]
group_display(arr)

输出结果：

Number 1 is found at indices: 0, 3, 8
Number 2 is found at indices: 1, 5, 9
Number 3 is found at indices: 2, 7
Number 4 is found at indices: 4
Number 5 is found at indices: 6

该示例中，group_display函数接受一个数组作为参数，并使用字典groups来记录每个数字在数组中出现的索引。然后，遍历字典中的每个键值对，并打印出数字以及对应的索引。