First of all apologies if this is something that has been asked before, my searching ability appears to have failed me then.

While using printf with formatting for zero padding on CF (including custom invocation), I encountered this strange behavior:

WA — 109283810

AC — 109284812

The only difference between these two submissions in the language chosen (32bit vs 64bit C++17).

In the 32-bit C++17 version, splitting the printf into 2 printfs also causes it to get AC — 109284259

1. Does CF use a different compiler / environment for 64 bit that could explain this difference in behavior?

2. Is there some undefined behavior in my code that is the source of this inconsistency?