#V. [GESP202306 一级] 累计相加

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[GESP202306 一级] 累计相加

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[GESP202306 一级] 累计相加

题目描述

输入一个正整数 nn，求形如：

1+(1+2)+(1+2+3)+(1+2+3+4)+⋯+(1+2+3+4+5+⋯+n)1+(1+2)+(1+2+3)+(1+2+3+4)+ \cdots +(1+2+3+4+5+ \cdots +n) 的累计相加。

输入格式

输入一个正整数 nn。约定 1<n≤1001<n \le 100。

输出格式

输出累计相加的结果。

样例 #1

样例输入 #1

3

样例输出 #1

10

样例 #2

样例输入 #2

4

样例输出 #2

20

样例 #3

样例输入 #3

10

样例输出 #3

220

20251012编程挑战精英赛训练

Not Attended
Status
Done
Rule
ACM/ICPC
Problem
51
Start at
2025-9-24 15:00
End at
2025-11-5 7:00
Duration
1000 hour(s)
Host
Partic.
58
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