foo.cc: In function 'int main()':
foo.cc:14:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;++i) scanf("%d",&a[i]);
                        ~~~~~^~~~~~~~~~~~
foo.cc:21:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d%d",&l,&r,&d);
    ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:30:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d",&l,&r);
    ~~~~~^~~~~~~~~~~~~~
foo.cc:38:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&t);
    ~~~~~^~~~~~~~~

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