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Comments
+8

As far as I can see this 

 printf("%I64d\n",n);

is not necessary yet. I checked on cppreference.com using different compilers and here using GNU and MS compilers. This piece of code 

 scanf("%lli\n",&n);
 printf("%lli\n",n);

works well. You can use %lld also. I'm not sure 100% that I properly tested it, but I think it is time to review this Q-A.