/in/foo.cc: In function 'int build(int, int)':
/in/foo.cc:28:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid=l+r>>1;
                 ~^~
/in/foo.cc: In function 'int update(int, int, int, int)':
/in/foo.cc:37:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid=l+r>>1;
                 ~^~
/in/foo.cc: In function 'int query(int, int, int, int, int, int)':
/in/foo.cc:45:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1,res=0;
             ~^~