foo.cc: In function 'int main()':
foo.cc:54:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&n,&r,&q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:62:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",s+i);
   ~~~~~^~~~~~~~~~
foo.cc:66:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",w+i);
   ~~~~~^~~~~~~~~~

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