Problem H: 从*开始学循环之H

Problem H: 从*开始学循环之H

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 353  Solved: 266
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Description

输入自然数n，输出2n-1行*，每行的字符依次递增，然后依次递减

Sample Input 

5

Sample Output 

*
**
***
****
*****
****
***
**
*
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