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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 Rrats, 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" Constraints: 1<=N<=350 Aij = {'O','X'} 1<=R<=N*N 1<=Xi<=N 1<=Yi<=N
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