2990:符号三角形

贤鱼不闲发布时间：2022-08-25 10:37:16 ，浏览量：0

2990:符号三角形蒟蒻题解

题目详情
AC代码（放心食用）

题目详情

描述符号三角形的第1行有n个由“+”和”-“组成的符号，以后每行符号比上行少1个，2个同号下面是”+“，2个异号下面是”-“ 。计算有多少个不同的符号三角形，使其所含”+“ 和”-“ 的个数相同。

n=7时的1个符号三角形如下:

输入每行1个正整数n

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2990:符号三角形

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