4 5 1 3 2 5 1 2 1 3 2 4 4 2 4 1 2 4 2 3 4 3 1 4 1 4 1 4
16/3 6/1
对于所有数据满足 1<=N<=50,000 1<=M<=50,000 1<=Ai<=10^6 1<=D<=100 1<=U,V<=N