/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:19:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     } int mid = l + r >> 1;
                 ~~^~~
/in/foo.cc: In function 'void modify(int, int, int, int, int)':
/in/foo.cc:27:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     } int mid = l + r >> 1;
                 ~~^~~
/in/foo.cc: In function 'node ask(int, int, int, int, int)':
/in/foo.cc:33:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~