求1+2+3.+...
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Description
用递归的方法求$1+2+3+……+N$的值。
Input Format
输入$N$。
Output Format
输出和。
5
15
You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.
用递归的方法求$1+2+3+……+N$的值。
输入$N$。
输出和。
5
15