An optimal and complete solution in Go (Golang) to solve the problem described.

```go
package main

import (
	"bufio"
	"os"
	"strconv"
)

// Configure fast I/O
var scanner *bufio.Scanner
var writer *bufio.Writer

func init() {
	scanner = bufio.NewScanner(os.Stdin)
	// Increase buffer size to handle large inputs
	scanner.Buffer(make([]byte, 2*1024*1024), 2*1024*1024)
	scanner.Split(bufio.ScanWords)
	writer = bufio.NewWriter(os.Stdout)
}

// Helper to read next integer
func nextInt() int {
	scanner.Scan()
	x, _ := strconv.Atoi(scanner.Text())
	return x
}

type Node struct {
	v, l, r int
}

func main() {
	defer writer.Flush()

	if !scanner.Scan() {
		return
	}
	n, _ := strconv.Atoi(scanner.Text())

	if n == 0 {
		writer.WriteString("0\n")
		return
	}

	// Temporary storage to determine if indices are 0-based or 1-based
	type rawNode struct {
		v, l, r int
	}
	rawNodes := make([]rawNode, n)

	minIdx := n + 1
	maxIdx := -1

	for i := 0; i < n; i++ {
		v := nextInt()
		l := nextInt()
		r := nextInt()
		rawNodes[i] = rawNode{v, l, r}

		if l != -1 {
			if l < minIdx {
				minIdx = l
			}
			if l > maxIdx {
				maxIdx = l
			}
		}
		if r != -1 {
			if r < minIdx {
				minIdx = r
			}
			if r > maxIdx {
				maxIdx = r
			}
		}
	}

	// Determine offset for child indices
	// Usually 1-based (offset 1) or 0-based (offset 0)
	offset := 0
	if maxIdx == n {
		// Indices go up to N, must be 1-based
		offset = 1
	} else if minIdx == 0 {
		// Indices include 0, must be 0-based
		offset = 0
	} else {
		// Indices are in range [1, N-1] or tree is trivial
		// Default to 1-based unless it causes a self-loop (which is invalid for trees)
		// In 1-based: line i (index i) corresponds to ID i+1.
		// If child index is i+1, it points to itself.
		isOneBased := true
		for i := 0; i < n; i++ {
			l, r := rawNodes[i].l, rawNodes[i].r
			if l == i+1 || r == i+1 {
				isOneBased = false
				break
			}
		}
		if isOneBased {
			offset = 1
		} else {
			offset = 0
		}
	}

	// Build the tree with 0-based indexing
	nodes := make([]Node, n)
	hasParent := make([]bool, n)

	for i := 0; i < n; i++ {
		nodes[i].v = rawNodes[i].v
		l := rawNodes[i].l
		r := rawNodes[i].r

		if l != -1 {
			l -= offset
			nodes[i].l = l
			// Validity check to avoid panic on bad input
			if l >= 0 && l < n {
				hasParent[l] = true
			}
		} else {
			nodes[i].l = -1
		}

		if r != -1 {
			r -= offset
			nodes[i].r = r
			if r >= 0 && r < n {
				hasParent[r] = true
			}
		} else {
			nodes[i].r = -1
		}
	}

	// Find root
	root := -1
	for i := 0; i < n; i++ {
		if !hasParent[i] {
			root = i
			break
		}
	}

	// If no root found (shouldn't happen for valid tree), default to 0
	if root == -1 {
		root = 0
	}

	// Identify values that can be found by the search algorithm
	foundValues := make(map[int]bool)

	// Iterative DFS to avoid stack overflow on deep trees
	type stackFrame struct {
		u        int
		min, max int
	}

	// The problem values are 0 to 10^9. We use bounds slightly outside this range.
	const MinBound = -1
	const MaxBound = 1000000001

	stack := []stackFrame{{root, MinBound, MaxBound}}

	for len(stack) > 0 {
		curr := stack[len(stack)-1]
		stack = stack[:len(stack)-1]

		u := curr.u
		val := nodes[u].v

		// If current node's value is within the valid search range for this position,
		// then the search algorithm looking for 'val' will correctly reach this node.
		if val > curr.min && val < curr.max {
			foundValues[val] = true
		}

		// Push right child: valid values must be > current val
		// New range is (max(curr.min, val), curr.max)
		if nodes[u].r != -1 {
			newMin := curr.min
			if val > newMin {
				newMin = val
			}
			// Optimization: only traverse if range is valid
			if newMin < curr.max {
				stack = append(stack, stackFrame{nodes[u].r, newMin, curr.max})
			}
		}

		// Push left child: valid values must be < current val
		// New range is (curr.min, min(curr.max, val))
		if nodes[u].l != -1 {
			newMax := curr.max
			if val < newMax {
				newMax = val
			}
			if curr.min < newMax {
				stack = append(stack, stackFrame{nodes[u].l, curr.min, newMax})
			}
		}
	}

	// Count failures
	failures := 0
	for i := 0; i < n; i++ {
		if !foundValues[nodes[i].v] {
			failures++
		}
	}

	writer.WriteString(strconv.Itoa(failures) + "\n")
}
```