86 lines
1.9 KiB
C++
86 lines
1.9 KiB
C++
#pragma comment(linker, "/STACK:102400000,102400000")
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#include <cstring>
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#include <cstdio>
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#include <iostream>
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#include <algorithm>
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#include <vector>
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#include <map>
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#include <set>
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#include <cmath>
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using namespace std;
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const int size=200111;
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typedef long long ll;
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ll inf=-1000111000ll;
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typedef pair<int,int> P;
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ll mod=1000000007;
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int t,n,m,a[size],K;
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vector<int>V[size];
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int vis[size],sum[size],id,tmp;
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void find(int u,int fa,int num){
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sum[u]=1;int K=0;
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for(int i=0;i<V[u].size();i++){
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int to=V[u][i];
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if(vis[to]||to==fa)continue;
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find(to,u,num);
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K=max(K,sum[to]);
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sum[u]+=sum[to];
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}
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K=max(K,num-sum[u]);
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if(K<tmp)tmp=K,id=u;
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}
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P b[size];
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int tot;
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void dfs(int u,int fa,int mi,int ma){
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sum[u]=1;
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mi=min(mi,a[u]);
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ma=max(ma,a[u]);
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if(ma<=mi+K)b[tot++]=P(mi,ma);
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for(int i=0;i<V[u].size();i++){
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int to=V[u][i];
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if(vis[to]||to==fa)continue;
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dfs(to,u,mi,ma);
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sum[u]+=sum[to];
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}
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}
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ll gao(int u,int mi,int ma){
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tot=0;
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dfs(u,0,mi,ma);
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sort(b,b+tot);
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ll ans=0;
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for(int i=0;i<tot;i++){
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int p=lower_bound(b,b+i,P(b[i].second-K,0))-b;
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ans+=i-p;
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}
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return ans;
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}
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ll work(int u,int num){
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tmp=n;
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find(u,0,num);
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u=id;
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ll ans=gao(u,a[u],a[u]);
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vis[u]=1;
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for(int i=0;i<V[u].size();i++){
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int to=V[u][i];
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if(!vis[to])ans-=gao(to,a[u],a[u]);
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}
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for(int i=0;i<V[u].size();i++){
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int to=V[u][i];
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if(!vis[to])ans+=work(to,sum[to]);
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}
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return ans;
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}
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int main(){
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cin>>t;
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while(t--){
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cin>>n>>K;
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for(int i=1;i<=n;i++)V[i].clear(),scanf("%d",&a[i]),vis[i]=0;
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for(int i=1;i<n;i++){
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int x,y;
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scanf("%d%d",&x,&y);
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V[x].push_back(y);
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V[y].push_back(x);
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}
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cout<<work(1,n)*2<<endl;
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}
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}
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