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

}