fix: speed up go algorithm

[mojixcoder]

You use int and it is converted to int64 in most of the machines which requires a lot RAM.
I changed it to int32 and here are the results.

Before: ~10.5s.

Now: ~2.8s in 4 runs on my local.

I didn't change the algorithm at all.

P.S. it is also possible to change it to uint32.

[hamidreza01]

Good job 👍