题解 | HJ76 #尼科彻斯定理#

import java.util.*;

// 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) {
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        int sum = (int)Math.pow(num, 3);
//        System.out.println(pow);
        int a = num * num + 1 - num;
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < num; i++) {
            builder.append(a);
            builder.append("+");
            a += 2;
        }
        builder.deleteCharAt(builder.length() - 1);
        System.out.println(builder);
    }
}

等差数列给定和与项数求首项值