Hello guys, I just realised how much of a difference putting const in a global variable can make. I was doing CSES problem Coin combinations II. I was getting tle on the problem for quite a while. Just for trying i changed the global mod value's datatype from long long to const long long. My code which was giving tle on 1s got executed in 0.2s due to that 1 change.

Here's my Old submission and here's the New one.