# Answer to Question #53893 in C for Biswambhar Pal

Question #53893

Problem : Trace the Rats

Given a square maze (A) of dimension N, every entry (Aij) in the maze is either an open cell 'O' or a wall 'X'. A rat can travel to its adjacent locations (left, right, top and bottom), but to reach a cell, it must be open. Given the locations of R rats, can you find out whether all the rats can reach others or not.

Input Format:

Input will consist of three parts, viz.

1. Size of the maze (N)

2. The maze itself (A = N * N)

3. Number of rats (R)

4. Location of R rats (Xi, Yi)

Note:

(Xi,Yi) will represents the location of the i-th rat.

Locations are 1-index based.

Output Format:

Print "Yes" if the rats can reach each other, else print "No"

Given a square maze (A) of dimension N, every entry (Aij) in the maze is either an open cell 'O' or a wall 'X'. A rat can travel to its adjacent locations (left, right, top and bottom), but to reach a cell, it must be open. Given the locations of R rats, can you find out whether all the rats can reach others or not.

Input Format:

Input will consist of three parts, viz.

1. Size of the maze (N)

2. The maze itself (A = N * N)

3. Number of rats (R)

4. Location of R rats (Xi, Yi)

Note:

(Xi,Yi) will represents the location of the i-th rat.

Locations are 1-index based.

Output Format:

Print "Yes" if the rats can reach each other, else print "No"

Expert's answer

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