Ratsun reitit

import java.util.Scanner;

public class Main {

    static int[][] chessBoard;
    static int n;
    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        n = input.nextInt();

        chessBoard = new int[n+4][n+4];

        int x = 0, y = 0;

        recursiveSolve(1, y, x);

        for(int i = 0; i < n; i++) {
            for(int j = 0; j < n; j++) {
                System.out.print(chessBoard[i][j]-1 + " ");
            }
            System.out.println();
        }

    }

    public static void recursiveSolve(int depth, int y, int x) {
        chessBoard[y][x] = depth;

        if(y+2 < n && y+2 >= 0 && x+1 < n && x+1 >= 0) {if(chessBoard[y+2][x+1] > depth+1 || chessBoard[y+2][x+1] == 0) {recursiveSolve(depth+1,y+2,x+1);}}
        if(y+2 < n && y+2 >= 0 && x-1 < n && x-1 >= 0) {if(chessBoard[y+2][x-1] > depth+1 || chessBoard[y+2][x-1] == 0) {recursiveSolve(depth+1,y+2,x-1);}}
        if(y-2 < n && y-2 >= 0 && x+1 < n && x+1 >= 0) {if(chessBoard[y-2][x+1] > depth+1 || chessBoard[y-2][x+1] == 0) {recursiveSolve(depth+1,y-2,x+1);}}
        if(y-2 < n && y-2 >= 0 && x-1 < n && x-1 >= 0) {if(chessBoard[y-2][x-1] > depth+1 || chessBoard[y-2][x-1] == 0) {recursiveSolve(depth+1,y-2,x-1);}}
        if(y+1 < n && y+1 >= 0 && x+2 < n && x+2 >= 0) {if(chessBoard[y+1][x+2] > depth+1 || chessBoard[y+1][x+2] == 0) {recursiveSolve(depth+1,y+1,x+2);}}
        if(y+1 < n && y+1 >= 0 && x-2 < n && x-2 >= 0) {if(chessBoard[y+1][x-2] > depth+1 || chessBoard[y+1][x-2] == 0) {recursiveSolve(depth+1,y+1,x-2);}}
        if(y-1 < n && y-1 >= 0 && x+2 < n && x+2 >= 0) {if(chessBoard[y-1][x+2] > depth+1 || chessBoard[y-1][x+2] == 0) {recursiveSolve(depth+1,y-1,x+2);}}
        if(y-1 < n && y-1 >= 0 && x-2 < n && x-2 >= 0) {if(chessBoard[y-1][x-2] > depth+1 || chessBoard[y-1][x-2] == 0) {recursiveSolve(depth+1,y-1,x-2);}}
    }
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 2, 3

Verdict: ACCEPTED

Test 10

Group: 2, 3

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED