You are given N qubits (2 ≤ N ≤ 8) which are guaranteed to be in one of the two states:

• state, or
• state.

  Your task is to perform necessary operations and measurements to figure out which state it was and to return 0 if it was state or 1 if it was W state. The state of the qubits after the operations does not matter.

  You have to implement an operation which takes an array of N qubits as an input and returns an integer.

  Your code should have the following signature:

  namespace Solution {
      open Microsoft.Quantum.Primitive;
      open Microsoft.Quantum.Canon;
  operation Solve (qs : Qubit[]) : Int
  {
      body
      {
          // your code here
      }
  }
  
  }