# C++每日一题 Day 5 数字楼梯

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### 知识点：for循环/循环嵌套

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## 题目描述

某人今天在体育馆里军训，面对着一个倒着的楼梯练习举牌子。这个楼梯的形状大概长这个样子：

> 0102030405 06070809 101112 1314 15

然后某人一站起身就一头撞在了楼梯上...他十分气愤，于是给了你一个整数n（n<8），请你输出这个n层\*n层的倒三角形的数字楼梯，每个数占两位。

## 输入

1个整数(<8)

## 输出

1个倒三角数字楼梯

## 输入输出样例

**输入**

```
5
```

**输出**

```
0102030405
06070809
101112
1314
15
```

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## 回答要求

* 附上你完成本程序的完整代码
* 详细解释for循环的组成及循环过程中执行的顺序


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