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1092F.go
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/
1092F.go
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package main
import (
"bufio"
. "fmt"
"io"
)
// github.com/EndlessCheng/codeforces-go
func CF1092F(_r io.Reader, out io.Writer) {
in := bufio.NewReader(_r)
var n, v, w int
Fscan(in, &n)
a := make([]int64, n)
for i := range a {
Fscan(in, &a[i])
}
g := make([][]int, n)
for i := 1; i < n; i++ {
Fscan(in, &v, &w)
v--
w--
g[v] = append(g[v], w)
g[w] = append(g[w], v)
}
ans := int64(0)
s := make([]int64, n)
var f func(v, fa, d int) int64
f = func(v, fa, d int) int64 {
ans += a[v] * int64(d)
s[v] = a[v]
for _, w := range g[v] {
if w != fa {
s[v] += f(w, v, d+1)
}
}
return s[v]
}
f(0, -1, 0)
var f2 func(int, int, int64)
f2 = func(v, fa int, sum int64) {
if sum > ans {
ans = sum
}
for _, w := range g[v] {
if w != fa {
f2(w, v, sum+s[0]-s[w]*2)
}
}
}
f2(0, -1, ans)
Fprint(out, ans)
}
//func main() { CF1092F(os.Stdin, os.Stdout) }