Does Karel attempt to move() in a 1x1 world? (Always use if(frontIsClear()) ).
// Fill a row going West, placing beepers on every other corner private void fillRowWest() while (frontIsClear()) move(); if (frontIsClear()) move(); putBeeper(); else if (noBeepersPresent()) putBeeper(); 645 checkerboard karel answer verified
Before we dive into the solution, let's review the problem requirements: Does Karel attempt to move() in a 1x1 world
The most reliable way to solve this is to think about each row individually while keeping track of whether the next row should start with a beeper or a blank space. if (frontIsClear()) move()