题解 | #尼科彻斯定理#

写的真恶心

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        while(scan.hasNext()){
            int m = scan.nextInt();
            int[] res = new int[m];
            if(m%2==0){
                int begin = m*m-m+1;
                for(int i = 0; i<m-1; i++){
                    res[i] = begin + 2*i;
                    System.out.print(res[i]+"+");
                }
                System.out.print(begin+2*(m-1));
            }
            else{
                int begin = m*m-m+1;
                for(int i = 0; i<m-1; i++){
                    res[i] = begin + 2*i;
                    System.out.print(res[i]+"+");
                }
                System.out.print(begin+2*(m-1));
            }
            
        }
        scan.close();
        
    }
}