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package main
import (
"fmt"
)
type TreeNode struct {
Val int
Left *TreeNode
Right *TreeNode
}
func max(a, b int64) int64 {
if a > b {
return int64(a)
} else {
return int64(b)
}
}
func maxProduct(root *TreeNode) int {
var total int64
var result int64
var sumUnder func(*TreeNode) int64
sumUnder = func(node *TreeNode) int64 {
var sum int64
if node == nil {
return 0
}
sum = sumUnder(node.Left) + sumUnder(node.Right) + int64(node.Val)
result = max(int64(result), sum*(total-sum))
return sum
}
total = sumUnder(root)
sumUnder(root)
return int(result % (1_000_000_000 + 7))
}
func main() {
fmt.Println("vim-go")
}
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