#include <bits/stdc++.h>
#define rep(i,l,r) for(int i=(l);i<=(r);++i)
#define per(i,r,l) for(int i=(r);i>=(l);--i)
using namespace std;
const int N=3e5+10,P=998244353,M=1e9,i2=(P+1)/2;
int a[N],u,v,n,cnt,s1,s2,ans,rt[N];
vector<int> G[N];
int su[N*40],w[N*40],tg[N*40],ls[N*40],rs[N*40];
inline void up(int o){
    su[o]=su[ls[o]]+su[rs[o]];
    w[o]=(w[ls[o]]+w[rs[o]])%P;
}
inline void add_tg(int o,int c){
    tg[o]=1ll*tg[o]*c%P;
    su[o]=1ll*su[o]*c%P;
    w[o]=1ll*w[o]*c%P;
}
inline void pd(int o){
    if(tg[o]!=1){
        if(ls[o]) add_tg(ls[o],tg[o]);
        if(rs[o]) add_tg(rs[o],tg[o]);
        tg[o]=1;
    }
}
void upd(int &o,int l,int r,int x,int y){
    if(!o) o=++cnt,tg[o]=1;
    if(l==r){su[o]+=y,w[o]=(w[o]+1ll*x*y)%P;return;}
    int mid=(l+r)>>1;pd(o);
    x>mid?upd(rs[o],mid+1,r,x,y):upd(ls[o],l,mid,x,y);
    up(o);
}
int merge(int x,int y,int l,int r){
    if(!x){s2=(s2+su[y])%P;add_tg(y,1ll*i2*s1%P);return y;}
    if(!y){s1=(s1+su[x])%P;add_tg(x,1ll*i2*s2%P);return x;}
    if(l==r){
        int p=su[x],q=su[y];
        su[x]=(1ll*p*s2+1ll*q*s1+1ll*p*q)%P*i2%P;
        w[x]=1ll*su[x]*l%P;
        s1=(s1+p)%P,s2=(s2+q)%P;
        return x;
    }pd(x),pd(y);
    int mid=(l+r)>>1;
    rs[x]=merge(rs[x],rs[y],mid+1,r);
    ls[x]=merge(ls[x],ls[y],l,mid);
    up(x);return x;
}
void dfs(int u,int p){
    upd(rt[u],1,M,a[u],1);
    for(int &v:G[u]) if(v^p)
        dfs(v,u),s1=0,s2=1,rt[u]=merge(rt[u],rt[v],1,M);
    if(u!=1) ans=(ans+w[rt[u]])%P;
}
int main(){
    //freopen("in","r",stdin);
    scanf("%d",&n);
    rep(i,1,n) scanf("%d",a+i);
    rep(i,1,n-1) scanf("%d%d",&u,&v),G[u].push_back(v),G[v].push_back(u);
    dfs(1,0);
    ans=(ans+2ll*w[rt[1]])%P;
    rep(i,1,n-2) ans=2*ans%P;
    printf("%d\n",ans);
    return 0;
}