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粘墙三角形
Time Limit:1000MS  Memory Limit:32768K

Description:

输入一些正整数(≤26),编程输出以这些正整数为边长的附墙而立的字母三角形。

Sample Input:

3
7

Sample Output:

a  a
a ab
aabc

a      a
a     ab
a    abc
a   abcd
a  abcde
a abcdef
aabcdefg
Status  Submit


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