Recently, I came across this blog which explains bitwise operations in vector (c++).

Problem: You are given 10**7 integers in the range [0,10**9], find the number of distinct integers.

In python making a boolean list/array wouldn't help, an integer will occupy at least 24 bits and a bool will occupy 8 bits, the issue is it would lead to MLE, which isn't desirable!

Are there any python alternatives for vector?

I looked up numPy (even though it's not allowed in online Judge) but it doesn't seem to have one. Bitarray might be of some help, but I believe it's not allowed in Online Judge either.