Main.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;

/**
 * Created on 11/30/17
 *
 * @author <a href="mailto:[email protected]">Ammar Al-khawaldeh</a>
 */
public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String line;
        String grid[][] = new String[9][9];

        for (int i = 0; i < 9; i++) {
            line = reader.readLine();
            if (line.charAt(0) != '|') {
                i--;
                continue;
            }
            line = line.substring(2, 23).replaceAll(" \\|", "");

            grid[i] = line.split(" ");
        }

        HashSet<Integer> row = new HashSet<>();
        HashSet<Integer> col = new HashSet<>();
        int rowItem;
        int colItem;
        for (int i = 0; i < 9; i++) {
            for (int j = 0; j < 9; j++) {
                rowItem = Integer.parseInt(grid[j][i]);
                colItem = Integer.parseInt(grid[i][j]);
                if (rowItem < 1 || rowItem > 9 || colItem < 1 || colItem > 9) {
                    System.out.println("Invalid");
                    return;
                }
                row.add(rowItem);
                col.add(colItem);

            }
            System.out.println("row: " + row);
            System.out.println("col: " + col);

            if (row.size() < 9 || col.size() < 9) {
                System.out.println("Invalid");
                return;
            }
            row.clear();
            col.clear();
        }

        System.out.println("valid");

    }

}