קוד:
import java.util.*;
public class Ans
{
static Scanner reader=new Scanner(System.in);
public static void main(String[]args)
{
int[][] grades=new int[20][2];
int i, j, both=0, one=0, nothing=0;
for(i=0;i<20;i++)
{
for(j=0;j<2;j++)
{
System.out.println("Enter grade "+j+" for student number "+i);
grades[i][j]=reader.nextInt(); //קלט למערך דו מימדי
}
}
for(i=0;i<20;i++)
{
for(j=0;j<1;j++)
{
if(gardes[i][j]>-1 && grades[i][j+1]>-1) //בדיקת כל התנאים
{
both++;
}
else{
if(gardes[i][j]==-1 && grades[i][j+1]==-1)
{
nothing++;
}
else{
one++;
}
}
}
}
System.out.println(both+" students submitted all reports. "+one+" students submitted 1 report. "+nothing+" students did not submit any report.");
}
}