题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
#include <stdio.h>
int main() {
int n;
scanf("%d",&n);
printf("%d",3*(n+1)*n/2-n);
return 0;
}
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
#include <stdio.h>
int main() {
int n;
scanf("%d",&n);
printf("%d",3*(n+1)*n/2-n);
return 0;
}
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