3
1 1 5
1 3 42
1 2 42
 2
42 23
1 2 10
 10
45792697 27183921 4791060 77070594 27286110 66957065 19283638 2944837 26775511 65379701
5 8 25
8 10 94
1 4 14
9 7 96
4 2 16
2 6 58
2 3 99
6 8 21
8 9 87
 5
3 1 2 6 5
1 2 3
2 3 1
4 3 9
5 3 1
 10
26 31 21 57 56 44 54 58 79 97
2 1 277
1 8 91
1 7 380
4 1 649
10 5 799
10 1 940
8 6 627
6 3 177
9 6 685
 10
8 100 62 38 26 51 26 23 77 32
6 8 29
4 1 82
7 8 66
7 10 67
8 9 98
6 1 14
1 5 48
3 1 58
2 9 90
 2
23 42
1 2 10
 1
42
 3
1 5 1
1 3 42
1 2 42
 10
1 1 1 1 1 1 1 1 1 1
1 2 5
1 3 5
1 4 5
1 5 5
1 6 5
1 7 5
1 8 5
1 9 5
1 10 5
 3
1 1 1
1 2 42
2 3 42
 3
5 1 1
1 3 42
1 2 24

3 1042.0638260857 1 727.3238618387 6 283959805416.40496826
 3 192.0000000000 1 13952642.4776933547 8 544327.1927847408 2 727.3238618387 1 0.0000000000 2 1042.0638260857 1 100.6230589875 2 544.3822186663 1 389.7666169867
#include<bits/stdc++.h>
#define reg register
typedef long long ll;
using namespace std;
const int MN=2e5+5;
int to[MN<<1],nxt[MN<<1],c[MN<<1],h[MN],cnt;
inline void ins(int s,int t,int w){
	to[++cnt]=t;nxt[cnt]=h[s];h[s]=cnt;c[cnt]=w;
	to[++cnt]=s;nxt[cnt]=h[t];h[t]=cnt;c[cnt]=w;
}
int n,rt,val[MN],siz[MN];
bool vis[MN];
void dfs(int st,int fa,int tot){
	siz[st]=1;reg int res=0;
	for(reg int i=h[st];i;i=nxt[i])
		if(to[i]!=fa&&!vis[to[i]]){
			dfs(to[i],st,tot);
			siz[st]+=siz[to[i]];
			res=max(res,siz[to[i]]);
		}
	res=max(res,tot-siz[st]);
	if(res<=tot/2)rt=st;
}
double d[MN],F,Ans=1e18;
int Pos;
void calc(int st,int fa,int top,int len){
	F+=pow(len,1.5)*val[st];
	d[top]+=pow(len,0.5)*1.5*val[st];
	for(reg int i=h[st];i;i=nxt[i])
		if(to[i]!=fa)calc(to[i],st,top,len+c[i]);
}
void dfs(int st,int tot){
	dfs(st,0,tot);dfs(st=rt,0,tot);
	if(vis[st])return;F=0;
	vis[st]=true;reg double D=0;
	for(reg int i=h[st];i;i=nxt[i])
		d[to[i]]=0,calc(to[i],st,to[i],c[i]),D+=d[to[i]];
	if(F<Ans)Ans=F,Pos=st;
	for(reg int i=h[st];i;i=nxt[i])
		if(D<d[to[i]]*2)dfs(to[i],siz[to[i]]);
}
int main(){
	scanf("%d",&n);
	for(reg int i=1;i<=n;i++)scanf("%d",val+i);
	for(reg int i=1,s,t,c;i<n;i++)
		scanf("%d%d%d",&s,&t,&c),ins(s,t,c);
	dfs(1,n);
	printf("%d %.10lf\n",Pos,Ans);
	return 0;
}