import stanford.karel.*;

public class TugasKarel extends SuperKarel
{
 int i;
 public void run()
  {
   i=1;
   while(frontIsClear())
   {
    if(i%2!=0)
     putBeeper();
    move();
    i=i+1;
     if(facingEast() && frontIsBlocked())
     {
      if(i%2!=0)
       putBeeper();
      turnLeft();
      if(frontIsClear())
      {
       move();
       turnLeft();
      }
      i=i+1;
     } 
     else if(facingWest() && frontIsBlocked())
     {
      turnRight();
      if(frontIsClear())
      {
       move();
       turnRight();
      }
      i=i+1;
     }
   }
  }
 }

/*
 * File: CollectNewspaperKarel.java
 * --------------------------------
 * At present, the CollectNewspaperKarel subclass does nothing.
 * Your job in the assignment is to add the necessary code to
 * instruct Karel to walk to the door of its house, pick up the
 * newspaper (represented by a beeper, of course), and then return
 * to its initial position in the upper left corner of the house.
 */

import stanford.karel.*;

public class CollectNewspaperKarel extends SuperKarel {
 
 public void turnAround() {
  turnLeft();
  turnLeft();
  }
  
 public void turnRight() {
  turnAround();
  turnLeft();
  }
  
 public void run() {
  turnRight();
  move();
  turnLeft();
  for(int i=0;i<3;i++) {
  move();
   }
  pickBeeper();
  turnLeft();
  turnLeft();
  while(!frontIsBlocked()) {
   move();
   }
  for (int i=0;i<3;i++) {
   turnLeft();
   }
  move();
  for (int i=0;i<3;i++) {
   turnLeft();
   }
  }
}

import stanford.karel.*;

public class RoadPavingKarel extends SuperKarel {
 
 public void fillHole() {
  turnRight();
  move();
  if (noBeepersPresent()) 
   putBeeper();
  turnAround();
  move();
  turnRight();
 }
 
 public void checkHole() {
  if (rightIsClear()) {
   fillHole();
  }
 }
 
 public void run() {
  while (frontIsClear()) {
   checkHole();
   move();
  }
  checkHole();
 }
}

import stanford.karel.*;

public class DoublingKarel extends SuperKarel
{
 public int countBeepers=0;
 
 public void doubleBeepers()
 {
  while(beepersPresent())
  {
   pickBeeper();
   countBeepers++;
  }
  for(int i=0; i<countBeepers*2; i++)
   putBeeper();
 }
 
 public void run()
 {
  move();
  doubleBeepers();
  move();
 }

}