/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:38:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1;
             ~^~
/in/foo.cc: In function 'void change(int, int, int, int, int, int)':
/in/foo.cc:46:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1;
             ~^~
/in/foo.cc: In function 'int query(int, int, int, int)':
/in/foo.cc:62:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~