题解 | #尼科彻斯定理#

玩的就是数学公式

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) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int a = in.nextInt();
            //216
            int target = a * a * a;
            // x * a + ()(2 + 2*(a-1)) * (a-1)) / 2 == target 
            // 化简 ==> x * a + a * (a - 1) == target
            int x = (target - a * (a - 1)) / a;
            for (int i = 1; i <= a; i++, x+=2) {
                if (i == a) {
                    System.out.print(x);
                } else {
                    System.out.print(x + "+");
                }

            }
        }
    }
}