/in/foo.cc: In function 'void add(int, int, int, int, int, int)':
/in/foo.cc:41:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid=l+r>>1;
                 ~^~
/in/foo.cc: In function 'int ask(int, int, int, int)':
/in/foo.cc:51:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1;
             ~^~
/in/foo.cc: In function 'int ask(int, int, int, int, int)':
/in/foo.cc:57:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1;
             ~^~
/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:84:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1;
             ~^~