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Main.cc: In function ‘int main()’:
Main.cc:12:24: error: ‘cmp’ was not declared in this scope
  qsort(a,n,sizeof(int),cmp);
                        ^~~
Main.cc:12:24: note: suggested alternative: ‘bcmp’
  qsort(a,n,sizeof(int),cmp);
                        ^~~
                        bcmp
Main.cc:8:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&s);
     ~~~~~^~~~~~~~~~~~~~
Main.cc:11:9: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&a[i]);
    ~~~~~^~~~~~~~~~~~