/in/foo.cc: In function 'node query(int, int, int, int, int)':
/in/foo.cc:45:7: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if((l==ql&r==qr)||l==r)return a[u];
      ~^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:67:24: warning: unused variable 'a' [-Wunused-variable]
   if(a>b&&k==1)int t=a,a=b,b=t;
                        ^
/in/foo.cc:67:28: warning: unused variable 'b' [-Wunused-variable]
   if(a>b&&k==1)int t=a,a=b,b=t;
                            ^