/in/foo.cc: In function 'int main()':
/in/foo.cc:75:7: warning: unused variable 'u' [-Wunused-variable]
   int u = q.front();
       ^
/in/foo.cc:112:19: warning: 'o.aa::i' may be used uninitialized in this function [-Wmaybe-uninitialized]
     he(o.i,a[i].i);
                   ^
/in/foo.cc:111:15: warning: 'o.aa::y' may be used uninitialized in this function [-Wmaybe-uninitialized]
    if(abs(o.y - a[i].y) <= m) 
           ~~~~^~~~~~~~