题解 | #尼科彻斯定理#

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        if (sc.hasNext()) {
            int input = sc.nextInt();
            int num=input*input*input;
            StringBuilder sb = new StringBuilder();
            for(int i=1;i<num;i+=2){
                if(input*i+((input-1)*input)==num){
                    for(int j =1;j<=input;j++){
                        if(j==input){
                            sb.append(i+(j-1)*2);
                        }else{
                            sb.append((i+(j-1)*2)+"+");
                        }
                    }
                }
            }
            System.out.println(sb);
        }
    }
}