foo.cc: In function 'int main()':
foo.cc:43:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   43 |                 int md=l+r>>1;
      |                        ~^~

正在同步测试数据，请稍后
[Hydro](https://hydro.ac)提供评测服务