Farmer John and his cows are planning to leave town for a long vacation, and so FJ wants to temporar

ily close down his farm to save money in the meantime.The farm consists of NN barns connected with M

M bidirectional paths between some pairs of barns (1≤N,M≤200,000). To shut the farm down, FJ plans

to close one barn at a time. When a barn closes, all paths adjacent to that barn also close, and ca

n no longer be used.FJ is interested in knowing at each point in time (initially, and after each clo

sing) whether his farm is "fully connected" -- meaning that it is possible to travel from any open b

arn to any other open barn along an appropriate series of paths. Since FJ's farm is initially in som

ewhat in a state of disrepair, it may not even start out fully connected.

给你N点M边的无向图(1<=N,M<=200000)，一共删n次点，

每次询问删这个点之前是否完全联通