Problem 4842. -- Poj1741 Tree
4842: Poj1741 TreeTime Limit: 1 Sec Memory Limit: 30 MB
Submit: 18 Solved: 13
Give a tree with n vertices,each edge has a length(positive integer less than 1001).
Define dist(u,v)=The min distance between node u and v.
Give an integer k,for every pair (u,v) of vertices is called valid if and only if dist(u,v) not exceed k.
Write a program that will count how many pairs which are valid for a given tree.
The input contains several test cases.
The first line of each test case contains two integers n, k. (n<=10000)
The following n-1 lines each contains three integers u,v,l, which means there is an edge between node u and v of length l.
The last test case is followed by two zeros.
For each test case output the answer on a single line.
1 2 3
1 3 1
1 4 2
3 5 1