July 2018
Beginner
202 pages
5h 4m
English
Content preview from Beginning Java Data Structures and Algorithms
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Activity: Using BFS to Find the Shortest Path Out of a Maze
Scenario
Our maze is an H by W rectangle, represented by an array of size H of W-sized strings. Each character in a string can either be '#' or '.'. '#' represents a wall, which we cannot cross, and '.' represents a free space, which we can cross. The border of the maze is always filled with '#' except for one square, which represents the exit. For example, the following is a valid maze:
Find the total number of steps to exit the maze, when supplied with a starting point (i, j) (with (0, 0) being the upper-left point and (H, W) being the lower-right point).
Aim
To use BFS to find ...
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