题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f?tpId=37&tqId=21323&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3Fpage%3D2%26tpId%3D37%26type%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=
import java.util.Scanner;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
final int D = 3;
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
int sum = (4 + (num - 1)*D)*num/2;
System.out.println(sum);
}
}
套公式
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