what this arguments besides a , what it is define?
What is vector<vector<ll>> a(k+1,vector<ll> k+1>?
@dhruvilcodes
this is the syntax for making a 2D vector, or, a vector of a vector of type ll.
The first argument is the size of the vector, and the second one is the thing you want to initialise it with.
So for eg if you wanted a vector of size n and all the elements inside to be initialised as -1, the syntax would be vector<int> v(n, -1)
Now we want a vector of type of vector, so the second argument is vector<ll>
I hope the size part is also clear, this will give you a k+1 * k+1 2D vector of type ll.
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