foo.cc: In function 'int main()':
foo.cc:8:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 | scanf("%d",&n);
      | ~~~~~^~~~~~~~~
foo.cc:22:1: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   22 | if (a==m)
      | ^~

[Hydro](https://hydro.ac)提供评测服务