Ruudukko

import java.util.Scanner;
import java.util.logging.Logger;
 
public class Tehtava1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int input = scanner.nextInt();
        int inputM = input - 1;
 
        String[][] posses = new String[input][input];
 
        for (int y = 0; y < input; y++) {
            int left = y;
            int right = inputM - y;
 
            for (int x = 0; x < right; x++) {
                posses[y + 1 + x][y] = String.valueOf(x + 2);
            }
 
            for (int x = 0; x < left; x++) {
                posses[y - 1 - x][y] = String.valueOf(input - x);
            }
 
            posses[y][y] = "1";
        }
 
        StringBuilder realString = new StringBuilder();
        for (int y = 0; y < input; y++) {
            StringBuilder str = new StringBuilder();
            for (int x = 0; x < input; x++) {
                str.append(posses[y][x]).append(' ');
            }
            realString.append(sub(str.toString())).append(y == inputM ? "" : "\n");
        }
 
        log(realString.toString());
    }
 
    private static String sub(String str) {
        String string = str;
        string.substring(0, str.length());
        return string;
    }
 
    private static void log(String msg) {
        System.out.println(msg);
    }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER