题解 | #等差数列#4行代码
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
#include <stdio.h>
int main() {
int num;
scanf("%d", &num);
int ret = num * 2 + num * (num - 1) * 3 / 2;
printf("%d", ret);
return 0;
}
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
#include <stdio.h>
int main() {
int num;
scanf("%d", &num);
int ret = num * 2 + num * (num - 1) * 3 / 2;
printf("%d", ret);
return 0;
}
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