题解 | #蛇形矩阵#

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);
        int num = in.nextInt();
        if(num<=0){
            return;
        }
        int[][] n = new int[num][num];
        int i = 0;
        int j = 0;
        int count = 1;
        int currentLen = 1;
        while(currentLen<=num){
            n[j][i] = count++;
            if(j==0){
                i = 0;
                j = currentLen;
                currentLen++;
                continue;
            }
            i++;
            j--;
        }
        for(int k = 0;k<num;k++){
            for(int l=0;l<num;l++){
                if(n[k][l]!=0){
                    System.out.print(n[k][l]+" ");
                }
            }
            System.out.println();
        }
    }
}