Boat Movements

A turn-based strategy game has a grid with water and land. The grid contains a true value where it's water and false where it's land.

The player controls a boat unit with a particular movement pattern. It can only move to fixed destinations from its current position as shown in the image below:

movement pattern

The boat can only move in a direct path through water to the possible destinations, so a destination will become unreachable if there is land in the way. 

Implement the canTravelTo function, that checks whether a destination is reachable by the boat. It should return true for destinations that are reachable according to the pattern above, and false for unreachable or out of bounds destinations which are outside the grid. 

For example, consider the following code:

boolean[][] gameMatrix = {
    {false, true,  true,  false, false, false},
    {true,  true,  true,  false, false, false},
    {true,  true,  true,  true,  true,  true},
    {false, true,  true,  false, true,  true},
    {false, true,  true,  true,  false, true},
    {false, false, false, false, false, false},

System.out.println(canTravelTo(gameMatrix, 3, 2, 2, 2)); // true, Valid move
System.out.println(canTravelTo(gameMatrix, 3, 2, 3, 4)); // false, Can't travel through land
System.out.println(canTravelTo(gameMatrix, 3, 2, 6, 2)); // false, Out of bounds

The following image shows valid and invalid destinations when the boat is in the position (3, 2):

terrain movement

Java SE 21


  • AI-resistant
  • Java
  • 2D Array
  • Graphs
  • New
  • Public
  • Hard


Difficulty: Hard

Duration: 30 min

Score Distribution

Not enough data for chart.

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