foo.cc: In function 'int main()':
foo.cc:15:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
  if(s==1) printf("%d\n",x);
                          ^
foo.cc:7:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld",&x);
  ~~~~~^~~~~~~~~~~

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