MainClass.java

package curse;

import java.util.HashSet;
import java.util.Iterator;

public class MainClass {
    static int n = M.n;

    public static void main(String[] args){

        int[][] res1 = new int[n][n];
        for (int i = 0; i < n; i++) res1[i][i] = 1;
        M rt1 = new M(res1); //единичная матрица
        int[][] res2 = new int[n][n];
        for (int i = 0; i < n; i++) res2[i][i] = 1;
        M rt2 = new M(res1); //единичная матрица
        HashSet<M> rtt = new HashSet<>();
        rtt.add(rt1);
        rtt.add(rt2);
        System.out.println(rtt.size());
    }
}