题目描述
Geek is very fond of patterns. Once, his teacher gave him a pattern to solve. He gave Geek an integer n and asked him to build a pattern.
Help Geek to build the pattern.
Example 1:
Input: 5
Output:
A
AB
ABC
ABCD
ABCDE
Your Task:
You don't need to input anything. Complete the function printTriangle() which takes an integer n as the input parameter and print the pattern.
Constraints:
1<= N <= 20
输入格式
见题面
输出格式
见题面
样例输入
5
样例输出
A
AB
ABC
ABCD
ABCDE