foo.cc: In function 'int main()':
foo.cc:79:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   79 |  freopen("railway.in","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:80:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   80 |  freopen("railway.out","w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:82:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   82 |  scanf("%d%d%d",&c,&s,&r);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:87:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   87 |         scanf("%d%d%d",&o[i],&d[i],&n[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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