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Problem B: 连续和(sum)
Problem B: 连续和(sum)
Time Limit:
1 Sec
Memory Limit:
128 MB
Submit:
1520
Solved:
838
[
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]
Description
输入正整数
n
,输出
1+2+
…
+
n
的值。
Sample Input
5
Sample Output
15
HINT
提示:目标是解决问题,而不是练习编程。