/in/foo.cc: In function 'int build(int, int)':
/in/foo.cc:17:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
/in/foo.cc: In function 'int change(int, int, int, int, int)':
/in/foo.cc:30:17: 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:38:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
/in/foo.cc: In function 'void add(int, int, int, int)':
/in/foo.cc:54:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~