From 7c3198cbc866eae0d00fb8a442f8f3b4ff7eb15c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C8=98tefan-Iulian=20Alecu?=
 <165364995+pascalecu@users.noreply.github.com>
Date: Wed, 6 May 2026 16:41:32 +0300
Subject: [PATCH] Add Depth First Search in Go

---
 archive/g/go/depth-first-search.go | 89 ++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 archive/g/go/depth-first-search.go

diff --git a/archive/g/go/depth-first-search.go b/archive/g/go/depth-first-search.go
new file mode 100644
index 000000000..e80f9c779
--- /dev/null
+++ b/archive/g/go/depth-first-search.go
@@ -0,0 +1,89 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const usage = `Usage: please provide a tree in an adjacency matrix form ("0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0") together with a list of vertex values ("1, 3, 5, 2, 4") and the integer to find ("4")`
+
+type Graph struct {
+	matrix []int
+	values []int
+	size   int
+}
+
+func main() {
+	if len(os.Args) != 4 {
+		printUsage()
+	}
+
+	matrix, errM := parseList(os.Args[1])
+	values, errV := parseList(os.Args[2])
+	target, errT := strconv.Atoi(os.Args[3])
+
+	if errM != nil || errV != nil || errT != nil {
+		printUsage()
+	}
+
+	n := len(values)
+	if len(matrix) != n*n || n == 0 {
+		printUsage()
+	}
+
+	g := &Graph{
+		matrix: matrix,
+		values: values,
+		size:   n,
+	}
+
+	visited := make([]bool, n)
+	if g.DFS(0, target, visited) {
+		fmt.Println("true")
+	} else {
+		fmt.Println("false")
+	}
+}
+
+func (g *Graph) DFS(curr, target int, visited []bool) bool {
+	if g.values[curr] == target {
+		return true
+	}
+
+	visited[curr] = true
+
+	for neighbor := 0; neighbor < g.size; neighbor++ {
+		edgeExists := g.matrix[curr*g.size+neighbor] == 1
+		if edgeExists && !visited[neighbor] {
+			if g.DFS(neighbor, target, visited) {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
+func parseList(input string) ([]int, error) {
+	if strings.TrimSpace(input) == "" {
+		return nil, fmt.Errorf("empty input")
+	}
+
+	parts := strings.Split(input, ",")
+	nums := make([]int, 0, len(parts))
+	for _, p := range parts {
+		val, err := strconv.Atoi(strings.TrimSpace(p))
+		if err != nil {
+			return nil, err
+		}
+		nums = append(nums, val)
+	}
+	return nums, nil
+}
+
+func printUsage() {
+	fmt.Println(usage)
+	os.Exit(1)
+}
\ No newline at end of file