CF1076E:Vasya and a Tree(DFS&差分)
Vasya has a tree consisting of n n vertices with root in vertex 1 1 . At first all vertices has 0 0 written on it.
Let d(i,j) d(i,j) be the distance between vertices i i and j j , i.e. number of edges in the shortest path from i i to j j . Also, let's denote k k -subtree of vertex x x — set of vertices y y such that next two conditions are met:
- x x is the ancestor of y y (each vertex is the ancestor of itself);
- d(x,y)≤k d(x,y)≤k .
Vasya needs you to process m m queries. The i i -th query is a triple v i vi , d i di and x i xi . For each query Vasya adds value x i xi to each vertex from d i di -subtree of v i vi .
Report to Vasya all values, written on vertices of the tree after processing all queries.
Input
The first line contains single integer n n (1≤n≤3⋅10 5 1≤n≤3⋅105 ) — number of vertices in the tree.
Each of next n−1 n−1 lines contains two integers x x and y y (1≤x,y≤n 1≤x,y≤n ) — edge between vertices x x and y y . It is guarantied that given graph is a tree.
Next line contains single integer m m (1≤m≤3⋅10 5 1≤m≤3⋅105 ) — number of queries.
Each of next m m lines contains three integers v i vi , d i di , x i xi (1≤v i ≤n 1≤vi≤n , 0≤d i ≤10 9 0≤di≤109 , 1≤x i ≤10 9 1≤xi≤109 ) — description of the i i -th query.
Output
Print n n integers. The i i -th integers is the value, written in the i i -th vertex after processing all queries.
Examples
- 5
- 1 2
- 1 3
- 2 4
- 2 5
- 3
- 1 1 1
- 2 0 10
- 4 10 100
- 1 11 1 100 0
- 5
- 2 3
- 2 1
- 5 4
- 3 4
- 5
- 2 0 4
- 3 10 1
- 1 2 3
- 2 3 10
- 1 1 7
- 10 24 14 11 11
Note
In the first exapmle initial values in vertices are 0,0,0,0,0 0,0,0,0,0 . After the first query values will be equal to 1,1,1,0,0 1,1,1,0,0 . After the second query values will be equal to 1,11,1,0,0 1,11,1,0,0 . After the third query values will be equal to 1,11,1,100,0 1,11,1,100,0
题意:给定一棵大小为N个树,Q次操作,每次给出三元组(u,d,x)表示给u为根的子树,距离u不超过d的点加值x。
思路:对于每个操作,我们在u处加x,在dep[u+d+1]处减去x。只需要传递一个数组,代表在深度为多少的时候减去多少即可,由于是DFS,满足操作都是在子树里的。
- #include<bits/stdc++.h>
- #define rep(i,a,b) for(int i=a;i<=b;i++)
- #define ll long long
- using namespace std;
- const int maxn=;
- int dep[maxn],N,Laxt[maxn],Next[maxn],To[maxn],cnt;
- int laxt2[maxn],next2[maxn],D[maxn],X[maxn],tot; ll ans[maxn];
- void add(int u,int v){
- Next[++cnt]=Laxt[u]; Laxt[u]=cnt; To[cnt]=v;
- }
- void add2(int u,int d,int x){
- next2[++tot]=laxt2[u]; laxt2[u]=tot; D[tot]=d; X[tot]=x;
- }
- void dfs(int u,int f,ll sum,ll *mp)
- {
- dep[u]=dep[f]+; sum-=mp[dep[u]];
- for(int i=laxt2[u];i;i=next2[i]){
- sum+=X[i];if(dep[u]+D[i]+<=N) mp[dep[u]+D[i]+]+=X[i];
- }
- ans[u]=sum;
- for(int i=Laxt[u];i;i=Next[i])
- if(To[i]!=f) dfs(To[i],u,sum,mp);
- for(int i=laxt2[u];i;i=next2[i]){
- sum-=X[i];if(dep[u]+D[i]+<=N) mp[dep[u]+D[i]+]-=X[i];
- }
- }
- ll mp[maxn];
- int main()
- {
- int u,v,x,Q; scanf("%d",&N);
- rep(i,,N-) {
- scanf("%d%d",&u,&v);
- add(u,v); add(v,u);
- }
- scanf("%d",&Q);
- rep(i,,Q) {
- scanf("%d%d%d",&u,&v,&x);
- add2(u,v,x);
- }
- dfs(,,0LL,mp);
- rep(i,,N) printf("%lld ",ans[i]);
- return ;
- }
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