COT - Count on a tree
You are given a tree with N nodes. The tree nodes are numbered from 1 to N. Each node has an integer weight.
We will ask you to perform the following operation:
- u v k : ask for the kth minimum weight on the path from node u to node v
In the first line there are two integers N and M. (N, M <= 100000)
In the second line there are N integers. The ith integer denotes the weight of the ith node.
In the next N-1 lines, each line contains two integers u v, which describes an edge (u, v).
In the next M lines, each line contains three integers u v k, which means an operation asking for the kth minimum weight on the path from node u to node v.
For each operation, print its result.
Input: 8 5 105 2 9 3 8 5 7 7 1 2 1 3 1 4 3 5 3 6 3 7 4 8
2 5 1
2 5 2
2 5 3
2 5 4
7 8 2
Can be done without persistent segment tree as well. Use mo's algorithm on trees with complexity O(n * root(n)). Though my solution passed barely after removing #define int int64_t, this never happened before, time limit was extremely close in my case :).
Last edit: 2021-06-02 05:53:13
Why is the source code limit for this problem so small (6 KB)? I can't even submit.
Finally got Accepted :')
the data u v in the input don't guarantee that u is the father of v
I have no idea about it, how can I solve it?
Not specifying w range is stupid :)Last edit: 2018-10-12 13:35:56
the abslute value of the weights can be > 1e9Last edit: 2018-06-14 02:24:21
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