#include <bits/stdc++.h>
const int MAXN = 2e5 + 5;
struct Edge {
  int to, w, nxt;
} e[MAXN << 1];
int head[MAXN], cnt;
inline void add(int u, int v, int w) {
  e[++cnt] = (Edge){v, w, head[u]};
  head[u] = cnt;
  e[++cnt] = (Edge){u, w, head[v]};
  head[v] = cnt;
}
int mx[MAXN], sz[MAXN], rt;
bool vis[MAXN];
inline void getroot(int v, int fa = 0) {
  mx[v] = 0;
  sz[v] = 1;
  for (int i = head[v]; i; i = e[i].nxt) {
    if (e[i].to == fa || vis[e[i].to]) continue;
    getroot(e[i].to, v);
    sz[v] += sz[e[i].to];
    mx[v] = std::max(mx[v], sz[e[i].to]);
  }
  mx[v] = std::max(mx[v], mx[0] - sz[v]);
  if (mx[rt] > mx[v]) rt = v;
}
double sd[MAXN], smd;
int d[MAXN], now;
inline void getdep(int v, long long dep, int fa = 0) {
  double d = 1.0 * ::d[v] * std::sqrt(1.0 * dep) * 3.0 / 2.0;
  sd[now] += d;
  smd += d;
  for (int i = head[v]; i; i = e[i].nxt) {
    if (e[i].to == fa) continue;
    getdep(e[i].to, dep + e[i].w, v);
  }
}
inline double getans(int v, long long dep = 0, int fa = 0) {
  double res = 1.0 * dep * sqrt(1.0 * dep) * d[v];
  for (int i = head[v]; i; i = e[i].nxt) {
    if (e[i].to == fa) continue;
    res += getans(e[i].to, dep + e[i].w, v);
  }
  return res;
}
int t1 = -1, t2 = -1;
int ans1;
double ans2 = 1e20;
inline void work(int v) {
  vis[v] = 1;
  smd = 0;
  for (int i = head[v]; i; i = e[i].nxt) {
    if (vis[e[i].to]) continue;
    now = e[i].to;
    sd[now] = 0;
    getdep(e[i].to, e[i].w, v);
  }
  double sm = getans(v);
  if (sm < ans2) {
    ans2 = sm;
    ans1 = v;
  }
  for (int i = head[v]; i; i = e[i].nxt) {
    if (vis[e[i].to]) continue;
    if (smd - sd[e[i].to] - sd[e[i].to] < 0) {
      mx[rt = 0] = sz[e[i].to];
      getroot(e[i].to);
      t1 = v;
      t2 = e[i].to;
      work(rt);
      return;
    }
  }
}
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 1; i <= n; ++i) scanf("%d", d + i);
  for (int i = 2; i <= n; ++i) {
    int u, v, w;
    scanf("%d%d%d", &u, &v, &w);
    add(u, v, w);
  }
  mx[rt = 0] = n;
  getroot(1);
  t1 = rt;
  work(rt);
  printf("%d %.10lf\n", ans1, ans2);
  return 0;
  if (t2 == -1) {
    printf("%d %.10lf\n", t1, getans(t1));
    return 0;
  }
  double ans1 = getans(t1), ans2 = getans(t2);
  if (ans1 < ans2)
    printf("%d %.10lf\n", t1, ans1);
  else
    printf("%d %.10lf\n", t2, ans2);
  return 0;
}
