I was just doing virtual on 1338A - Powered Addition.

I wrote the following code: 121160133

and it out puts "63" on this test: N = 5, A = {-9, -2, -2, 7, 5} on both versions of C++17.

But I thought __lg(0) is -1?

Does anyone have any idea?

(Also I tried to use custom invocation and try to exit once "ans" is changed to 63 but nothing happened.)