/in/foo.cc: In function 'int rotate(int, int)':
/in/foo.cc:20:45: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                 d ^= 1 << 5 * (xx - 1) + yy - 1;
                           ~~~~~~~~~~~~~~~~~~^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:54:62: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                 if(t[j - 1] - '0') s |= 1 << (i - 1) * 5 + j - 1;
                                              ~~~~~~~~~~~~~~~~^~~
/in/foo.cc: In function 'int BFS()':
/in/foo.cc:42:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^