foo.cc: In function 'int main()':
foo.cc:84:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   84 |  freopen("a.in","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:85:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   85 |  scanf("%d%d",&n,&k);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:87:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   87 |  scanf("%d",&dis[i]);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:89:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   89 |  scanf("%d",&fy[i]);
      |  ~~~~~^~~~~~~~~~~~~
foo.cc:91:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   91 |  scanf("%d",&fw[i]);
      |  ~~~~~^~~~~~~~~~~~~
foo.cc:93:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   93 |  scanf("%d",&bc[i]);
      |  ~~~~~^~~~~~~~~~~~~

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