*********
Example 3
*********

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Input (election instance from Example 1):
-----------------------------------------

profile with 12 voters and 8 candidates:
 3 x {a, b},
 3 x {a, c},
 2 x {a, d},
 1 x {b, c, f},
 1 x {e},
 1 x {f},
 1 x {g}

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Approval Chamberlin-Courant (CC)
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Algorithm: branch-and-bound

Optimal CC-score: 12

1 winning committee:
 {a, e, f, g}

