/in/foo.cc: In function 'void buildtree(int, int, int)':
/in/foo.cc:166:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=LSIDE(rt)+RSIDE(rt)>>1;
                   ^
/in/foo.cc: In function 'void update_add(int, int, int, int)':
/in/foo.cc:180:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=LSIDE(rt)+RSIDE(rt)>>1;
                   ^
/in/foo.cc: In function 'void update_del(int, int, int, int)':
/in/foo.cc:194:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=LSIDE(rt)+RSIDE(rt)>>1;
                   ^
/in/foo.cc: In function 'long long int query(int, int, int)':
/in/foo.cc:204:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=LSIDE(rt)+RSIDE(rt)>>1;
                   ^
/in/foo.cc: In function 'void work()':
/in/foo.cc:211:10: warning: unused variable 'l' [-Wunused-variable]
  int x,y,l,r;
          ^
/in/foo.cc:211:12: warning: unused variable 'r' [-Wunused-variable]
  int x,y,l,r;
            ^