/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:12:11: 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:33:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'void query(int, int, int, int, int)':
/in/foo.cc:43:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~