foo.cc: In function 'int bfs(int, int)':
foo.cc:15:72: warning: array subscript 2 is above array bounds of 'int [2]' [-Warray-bounds]
   15 |                         int nx =q[l][0]+dir[i][1],ny = q[l][1]+dir[i][2];
      |                                                                ~~~~~~~~^
foo.cc:3:24: note: while referencing 'dir'
    3 | int n,m,list[105][105],dir[4][2] = {{0,1},{0,-1},{1,0},{-1,0}};
      |                        ^~~

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