foo.cc: In function 'void build(int, int, int)':
foo.cc:26:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   26 |     int mid = l + r >> 1;
      |               ~~^~~
foo.cc: In function 'int ask(int, int, int)':
foo.cc:35:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   35 |     int mid = r(l) + l(u) >> 1;
      |                    ^
foo.cc:38:14: warning: self-comparison always evaluates to false [-Wtautological-compare]
   38 |     if ( mid < mid ) res = max(res, ask(u << 1 | 1, l, r));
      |          ~~~ ^ ~~~
foo.cc: In function 'void change(int, int, int)':
foo.cc:46:24: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |         int mid = r(u) + l(u) >> 1;
      |                        ^

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