foo.cc: In function 'int main()':
foo.cc:37:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 | scanf("%s", a+1);
      | ~~~~~^~~~~~~~~~~
foo.cc:38:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 | scanf("%s", b+1);
      | ~~~~~^~~~~~~~~~~

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