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If you're on Windows, this would be a good way to start: https://github.com/ocornut/imgui/tree/master/examples/example_win32_directx9
With 2.5 days you probably don't want anything that requires much setup, so Qt is probably a non-starter. You could try this one: https://github.com/wjakob/nanogui, the examples are not the platonic ideal of modern C++ programming, but that also means you don't need much mastery of the language to hammer a program until it has a GUI.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.