POJ3660 Cow Contest {图论}【最短路】（Floyd，传递闭包）
POJ3660 Cow Contest（Floyd）DescriptionN (1 ≤ N ≤ 100) cows, conveniently numbered 1…N, are participating in a programming contest. As we all know, some cows code better than others. Each cow has a certain constant skill rating that is unique among the
