Treasures in a map (4)

Write a program that, given a map with treasures and obstacles, computes
the distance from a given initial position to the furthest accessible
treasure. The allowed movements are horizontal or vertical, but not
diagonal. If needed, passing over the treasures is allowed.

Input

Input begins with the number of rows n > 0 and the number of columns
m > 0 of the map. Follow n rows with m characters each. A dot indicates
an empty position, an ‘X’ indicates an obstacle, and a ‘t’ indicates a
treasure. Finally, two numbers r and c indicate the initial row and
column (both of them starting at 1) where we must start looking for
treasures. You can assume that r is between 1 and n, that c is between 1
and m, and that the initial position is always empty.

Output

Print the minimum number of steps to reach the furthest treasure from
the initial position. If no treasure is accessible, tell so.

Problem information

Author: Unknown
Translator: Carlos Molina

Generation: 2026-01-25T10:41:39.060Z

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