URAL 2030 Awesome Backup System

Awesome Backup System

Time limit: 2.0 second
Memory limit: 64 MB

It is known that all people can be divided into two groups: those who have never lost important data and those who regularly perform data backups. Kirill is on his way from the first group to the second after the incident with tests described in the problem “Another Dress Rehearsal”. Not satisfied with the existing data backup solutions for various reasons, he decided to design his own backup system. He chose a simple but proud name for it: the “Awesome Backup System,” ABS for short. Since errors in such an important system are absolutely unacceptable, Kirill asks you to test the beta version of his product.

The ABS is organized as follows: let there be n computers in a local network. The computers are numbered with integers from 1 to n. Some pairs of computers are connected by cables. For economy, the network doesn’t have unnecessary cables, which means that there is a unique cable path between any two computers. Initially there are a_i bytes of information written on the i-th computer. The ABS can process two types of requests:

1. Copy all the information from computer v to all adjacent computers (i.e., to all computers directly connected to it by a cable) If computer v had x_v bytes of information, then, after copying, all adjacent computers will have x_v bytes of information more, while computer v will still have x_v bytes of information.
2. Output the current amount of information on computer v. Since this amount can grow very quickly, output the remainder of its division by the number 10⁹ + 7.

For testing the ABS, you are asked to write a program for a quick processing of such requests.

Input

The first line contains the number n of computers in the network (1 ≤ n ≤ 10⁵). In the second line you are given integers a₁, …, a_n, which are the amounts of information (in bytes) on the computers at the initial time (0 ≤ a_i ≤ 10⁹). Each of the following n − 1 lines contains integers x and y (1 ≤ x, y ≤ n; x ≠ y), which mean that the computers with numbers x and y are connected by a cable. It is guaranteed that the network is connected.

The next line contains the number m of requests to the system (1 ≤ m ≤ 10⁵). In the following m lines you are given the requests in the order of their execution. Each request is a pair of integers t and v (1 ≤ t ≤ 2 and 1 ≤ v ≤ n), where t specifies the type of the request and v is the number of the computer to which the request is applied.

Output

For each request of the second type, output in a separate line the remainder of the division of the answer by the number 10⁹ + 7.

Samples

input	output
4 1 1 1 1 1 2 1 3 2 4 9 2 1 2 2 2 3 2 4 1 1 2 1 2 2 2 3 2 4	1 1 1 1 1 2 2 1
2 1 1 1 2 14 2 2 2 1 1 1 2 2 1 2 2 1 1 1 2 2 1 2 2 1 1 1 2 2 1 2 2 1	1 1 2 3 5 8 13 21

Problem Author: Nikita Sivukhin

对一棵树进行下列操作

1 v 将顶点v的邻接顶点的权值加上w[v]

2 v 查询顶点v的权值

哎，还是太弱了，这题不需要任何数据结构，只需要先将树转换成有根树，开一个标记数组add，add[v]表示给v的邻接顶点增加了add[v]，在进行1操作的时候，直接将v的父亲加上v的权值，则查询的时候只有父亲对他有影响，加上父亲的add标记就行

#include <iostream>
#include <cstring>
#include <cstdio>
#include <algorithm>
#include <cmath>
#include <string>
#include <map>
#include <stack>
#include <queue>
#include <vector>
#define inf 0x3f3f3f3f
#define met(a,b) memset(a,b,sizeof a
#define pb push_back
typedef long long ll;
using namespace std;
const int N = 1e5+;
const int M = +;
const int mod=1e9+;
int n,m,k,tot=,s,t,r;
vector<int>G[N];
ll A[N],add[N];

int p[N];
void dfs(int u,int fa)
{
    p[u]=fa;
    for(int i=; i<G[u].size(); i++)
    {
        int &v=G[u][i];
        if(v!=fa&&v!=u)
        {
            dfs(v,u);
        }
    }
}
int main()
{
    int n,m;
    cin>>n;
    for(int i=;i<=n;i++)cin>>A[i];
    int u,v;
    for(int i=;i<n;i++)
    {
        cin>>u>>v;
        G[u].pb(v);
        G[v].pb(u);
    }
    cin>>m;
    memset(add,,sizeof add);
    memset(p,,sizeof p);
    dfs(,);
    while(m--)
    {
        cin>>u>>v;
        int x=p[v];
        if(u==)
        {
            add[v]=(add[v]+A[v]+add[x])%mod;
            A[x]=(A[x]+A[v]+add[x])%mod;
        }
        else cout<<(A[v]+add[x])%mod<<endl;
    }
    return ;
}