TREESUM - Tree Sum
Let Lx denote the level of a node x in a rooted tree. Lx is 1 if x is the root, otherwise Lx = 1 + Ly, where y is the parent of x in the rooted tree.
You need to calculate the sum Lx ^ K for all nodes x in the tree.
The first line contains the number of test cases T. T test cases follow. The first line of each test case contains N and K, where N is the number of nodes in the tree. The following N - 1 lines contain two integers ai and bi, indicating an edge between nodes ai and bi in the tree. There is a blank line after each test case.
Output N lines for each test case. The i-th line should contain the required sum if the tree is rooted at node i. Output all values modulo 1000000007. Output a blank line after each test case.
Sample Input: 2 3 2 0 1 1 2 3 3 0 1 0 2 Sample Output: 14 9 14 17 36 36
1 <= T <= 10
1 <= N <= 20000
1 <= K <= 20
0 <= ai, bi < N
Last edit: 2014-11-03 16:19:27
nice problem !!
Really a Nice Problem!
Kazi Rakibul Hossain: