/in/foo.cc: In function 'int dfs(int, int, int, int)':
/in/foo.cc:18:44: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(nx<0||nx>=n||ny<0||ny>=m||nx==fx&&ny==fy||bmap[nx][ny]=='#')
                                      ~~~~~~^~~~~~~~