import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.Arrays;
import java.util.ArrayList;
public class Main {
    //Program start
    
    //Program end

    @Test
public void test1() {
    assertEquals(2, minRectanglesToCoverPoints(new ArrayList<>(Arrays.asList(new ArrayList<>(Arrays.asList(2,1)),new ArrayList<>(Arrays.asList(1,0)),new ArrayList<>(Arrays.asList(1,4)),new ArrayList<>(Arrays.asList(1,8)),new ArrayList<>(Arrays.asList(3,5)),new ArrayList<>(Arrays.asList(4,6)))), 1));
}
@Test
public void test2() {
    assertEquals(3, minRectanglesToCoverPoints(new ArrayList<>(Arrays.asList(new ArrayList<>(Arrays.asList(0,0)),new ArrayList<>(Arrays.asList(1,1)),new ArrayList<>(Arrays.asList(2,2)),new ArrayList<>(Arrays.asList(3,3)),new ArrayList<>(Arrays.asList(4,4)),new ArrayList<>(Arrays.asList(5,5)),new ArrayList<>(Arrays.asList(6,6)))), 2));
}
@Test
public void test3() {
    assertEquals(2, minRectanglesToCoverPoints(new ArrayList<>(Arrays.asList(new ArrayList<>(Arrays.asList(2,3)),new ArrayList<>(Arrays.asList(1,2)))), 0));
}

}