TypeError: unsupported operand type(s) for *: 'IntVar' and 'float' in ortools [closed]

Question

I am trying to implement a constraint as follows:

routing.solver().Add(capacity_dimension.CumulVar(idx) * routing.ActiveVar(idx) >= capacity_dimension.CumulVar(routing.End(v)) * 0.5 )

It gives error:

TypeError: unsupported operand type(s) for *: 'IntVar' and 'float'

How can I resolve this?

I tried capacity_dimension.CumulVar(routing.End(v)).Value() * 0.5 on RHS but this kills the kernel.

Answer 1

This is solved as follows:

2 * capacity_dimension.CumulVar(idx) * routing.ActiveVar(idx) >= capacity_dimension.CumulVar(routing.End(v))