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1519D.go
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1519D.go
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package main
import (
"bufio"
. "fmt"
"io"
)
// github.com/EndlessCheng/codeforces-go
func CF1519D(_r io.Reader, out io.Writer) {
in := bufio.NewReader(_r)
max := func(a, b int64) int64 {
if b > a {
return b
}
return a
}
var n int
Fscan(in, &n)
a := make([]int64, n)
for i := range a {
Fscan(in, &a[i])
}
sum := int64(0)
b := make([]int64, n)
for i := range b {
Fscan(in, &b[i])
sum += a[i] * b[i]
}
ans := sum
for i := 0; i < n; i++ {
cur := sum
for l, r := i-1, i+1; l >= 0 && r < n; l-- {
cur -= (a[l] - a[r]) * (b[l] - b[r])
ans = max(ans, cur)
r++
}
cur = sum
for l, r := i-1, i; l >= 0 && r < n; l-- {
cur -= (a[l] - a[r]) * (b[l] - b[r])
ans = max(ans, cur)
r++
}
}
Fprint(out, ans)
}
//func main() { CF1519D(os.Stdin, os.Stdout) }