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4409: Can Bash Save the Day?

内存限制：256 MB 时间限制：2 S
题面：传统 评测方式：文本比较 上传者：
提交：7 通过：1
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题目描述

time limit per test
5 seconds
memory limit per test
768 megabytes
input
standard input
output
standard output
Whoa! You did a great job helping Team Rocket who managed to capture all the Pokemons sent by Bash. Meowth, part of Team Rocket, having already mastered the human language, now wants to become a master in programming as well. He agrees to free the Pokemons if Bash can answer his questions.
Initially, Meowth gives Bash a weighted tree containing n nodes and a sequence a1,a2...,an which is a permutation of 1,2,...,n. Now, Mewoth makes q queries of one of the following forms:
  • 1 l r v: meaning Bash should report , where dist(a,b) is the length of the shortest path from node a to node b in the given tree.
  • 2 x: meaning Bash should swap ax and ax+1 in the given sequence. This new sequence is used for later queries.
Help Bash to answer the questions!
Input
The first line contains two integers n and q (1≤n≤2·105, 1≤q≤2·105)− the number of nodes in the tree and the number of queries, respectively.
The next line contains n space-separated integers− the sequence a1,a2,...,an which is a permutation of 1,2,...,n.
Each of the next n-1 lines contain three space-separated integers u, v, and w denoting that there exists an undirected edge between node u and node v of weight w, (1≤u,v≤n, u≠v, 1≤w≤106). It is guaranteed that the given graph is a tree.
Each query consists of two lines. First line contains single integer t, indicating the type of the query. Next line contains the description of the query:
  • t = 1: Second line contains three integers a, b and c (1≤a,b,c<230) using which l, r and v can be generated using the formula given below:
    • ,
    • ,
    • .
  • t = 2: Second line contains single integer a (1≤a<230) using which x can be generated using the formula given below:
    • .
The ansi is the answer for the i-th query, assume that ans0=0. If the i-th query is of type 2 then ansi = ansi-1. It is guaranteed that:
  • for each query of type 1: 1≤l≤r≤n, 1≤v≤n,
  • for each query of type 2: 1≤x≤n-1.
The operation means bitwise exclusive OR.
Output
For each query of type 1, output a single integer in a separate line, denoting the answer to the query.
Example
Input
5 5
4 5 1 3 2
4 2 4
1 3 9
4 1 4
4 5 2
1
1 5 4
1
22 20 20
2
38
2
39
1
36 38 38
Output
23
37
28
Note
In the sample, the actual queries are the following:
  • 1 1 5 4
  • 1 1 3 3
  • 2 3
  • 2 2
  • 1 1 3 3

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