Types: n: int, vw: int, vc: int, coordinates: List[Tuple[int, int]]
Ranges: 1 ≤ n ≤ 1,000, 1 ≤ vw, vc ≤ 10, -10,000 ≤ xi, yi ≤ 10,000
Addtl Info: xi < xj for all i < j, input terminated by n = 0