/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:152:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid = l + r >> 1;
                   ~~^~~
/in/foo.cc: In function 'void modify(int, int, int)':
/in/foo.cc:165:27: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid = tr[u].l + tr[u].r >> 1;
                   ~~~~~~~~^~~~~~~~~
/in/foo.cc: In function 'int query_kth_number(int, int, int)':
/in/foo.cc:184:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid = l + r + 1 >> 1;
                   ~~~~~~^~~