foo.cc: In function 'int main()':
foo.cc:7:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
foo.cc:9:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |         scanf("%s %s", S1, S2);
      |         ~~~~~^~~~~~~~~~~~~~~~~

正在同步测试数据，请稍后
Found 5 testcases.
[Hydro](https://hydro.ac)提供评测服务