题解 | #等差数列#
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
#include<stdio.h>
int main() { int n = 0;
while (scanf("%d", &n) != EOF)
{
int tmp = 2;
int sum = 0;
while (n--)
{
sum += tmp;
tmp += 3;
}
printf("%d\n", sum);
}
return 0;
}
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