/in/foo.cc: In function 'void BFS()':
/in/foo.cc:29:38: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    if(y<3 && (tmp&(1<<i))!=(tmp&(1<<i-1))) {
                                     ~^~
/in/foo.cc:30:11: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     z=1<<i-1;
          ~^~
/in/foo.cc:38:38: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    if(x<3 && (tmp&(1<<i))!=(tmp&(1<<i-4))) {
                                     ~^~
/in/foo.cc:39:11: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     z=1<<i-4;
          ~^~