/in/foo.cc: In function 'int RMQ(int, int)':
/in/foo.cc:29:9: warning: 'Id' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return Id;
         ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:79:10: warning: 'Id' may be used uninitialized in this function [-Wmaybe-uninitialized]
    tmp.nw=RMQ(tmp.l,tmp.r);
    ~~~~~~^~~~~~~~~~~~~~~~~
/in/foo.cc:72:10: warning: 'Id' may be used uninitialized in this function [-Wmaybe-uninitialized]
    tmp.nw=RMQ(tmp.l,tmp.r);
    ~~~~~~^~~~~~~~~~~~~~~~~
/in/foo.cc:55:9: warning: 'Id' may be used uninitialized in this function [-Wmaybe-uninitialized]
   tmp.nw=RMQ(i+l-1,min(n,i+r-1));
   ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~