From 268d0a0141f7aff28ddd3d9e4b6a87121f28ca0a Mon Sep 17 00:00:00 2001
From: Brian Buller <brian@bullercodeworks.com>
Date: Mon, 23 Dec 2024 07:27:58 -0600
Subject: [PATCH] 2024 Day 23 Complete

---
 2024/day23/input     | 3380 ++++++++++++++++++++++++++++++++++++++++++
 2024/day23/main.go   |  179 +++
 2024/day23/testinput |   32 +
 helpers/set.go       |   72 +
 4 files changed, 3663 insertions(+)
 create mode 100644 2024/day23/input
 create mode 100644 2024/day23/main.go
 create mode 100644 2024/day23/testinput
 create mode 100644 helpers/set.go

diff --git a/2024/day23/input b/2024/day23/input
new file mode 100644
index 0000000..7fe89d0
--- /dev/null
+++ b/2024/day23/input
@@ -0,0 +1,3380 @@
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diff --git a/2024/day23/main.go b/2024/day23/main.go
new file mode 100644
index 0000000..19b2326
--- /dev/null
+++ b/2024/day23/main.go
@@ -0,0 +1,179 @@
+package main
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+	fmt.Println()
+	part2(inp)
+}
+
+func parseInput(inp []string) NetworkMap {
+	network := make(map[string]h.Set)
+	for _, l := range inp {
+		pts := strings.Split(l, "-")
+		if _, ok := network[pts[0]]; !ok {
+			network[pts[0]] = h.NewSet(1)
+		}
+		if _, ok := network[pts[1]]; !ok {
+			network[pts[1]] = h.NewSet(1)
+		}
+		network[pts[0]].Add(pts[1])
+		network[pts[1]].Add(pts[0])
+	}
+	return NewNetworkMap(network)
+}
+
+func part1(inp []string) {
+	nwk := parseInput(inp)
+	fmt.Println("# Part 1")
+	total := 0
+	wrk := nwk
+	for _, comp := range wrk.Comps {
+		conns := make([]string, 0, len(comp.Conns))
+		for name := range comp.Conns {
+			conns = append(conns, name)
+			total++
+		}
+	}
+	tris := wrk.FindTGroups()
+	fmt.Println(len(tris))
+}
+
+func part2(inp []string) {
+	nwk := parseInput(inp)
+	cnt := len(nwk.Comps)
+	wrk := h.NewSet(cnt)
+	for nm := range nwk.Comps {
+		wrk.Add(nm)
+	}
+	group := BronKerbosch(h.NewSet(cnt+1), wrk, h.NewSet(cnt+1), h.NewSet(0), nwk.Network)
+	fmt.Println("Group Size:", group.Size())
+	fmt.Println("Password:", strings.Join(group.ToSortedSlice(), ","))
+}
+
+func BronKerbosch(cl, chk, excl, kmax h.Set, graph map[string]h.Set) h.Set {
+	if chk.Empty() && excl.Empty() {
+		return cl
+	}
+	for vx := range chk {
+		vxSet := h.NewSetFromValues(vx)
+		vxConns := graph[vx]
+		nC := cl.Union(vxSet)
+		nWrk := chk.Intersection(vxConns)
+		if nC.Size()+nWrk.Size() <= kmax.Size() {
+			continue
+		}
+		newExcl := excl.Intersection(vxConns)
+		fC := BronKerbosch(nC, nWrk, newExcl, kmax, graph)
+		if fC.Size() > kmax.Size() {
+			kmax = fC
+		}
+		chk.Remove(vx)
+		excl.Add(vx)
+	}
+	return kmax
+}
+
+type NetworkMap struct {
+	Network map[string]h.Set
+	Comps   map[string]*Comp
+}
+
+func NewNetworkMap(nwk map[string]h.Set) NetworkMap {
+	nm := NetworkMap{Network: nwk, Comps: make(map[string]*Comp)}
+	for name, conns := range nwk {
+		for conn := range conns {
+			nm.Connect(name, conn)
+		}
+	}
+	return nm
+}
+
+func (n *NetworkMap) Connect(c1, c2 string) {
+	n.GetComputer(c1).Connect(n.GetComputer(c2))
+}
+
+func (n *NetworkMap) GetComputer(nm string) *Comp {
+	if cm, ok := n.Comps[nm]; ok {
+		return cm
+	}
+	cm := NewComp(nm)
+	n.Comps[nm] = cm
+	return cm
+}
+
+func (n *NetworkMap) FindTGroups() map[Group]bool {
+	ret := make(map[Group]bool)
+	chk := make(map[string]bool)
+	for cn, comp := range n.Comps {
+		if chk[cn] {
+			continue
+		}
+		for nn, next := range comp.Conns {
+			friends := comp.FindFriends(next)
+			for _, friend := range friends {
+				if cn[0] == 't' || nn[0] == 't' || friend[0] == 't' {
+					grp := NewGroup([3]string{cn, nn, friend})
+					ret[grp] = true
+				}
+			}
+			chk[cn] = true
+		}
+	}
+	return ret
+}
+
+type Group struct {
+	Comps [3]string
+}
+
+func NewGroup(nodes [3]string) Group {
+	s := nodes[:]
+	sort.Strings(s)
+	return Group{Comps: [3]string{s[0], s[1], s[2]}}
+}
+
+func (g Group) String() string {
+	return fmt.Sprintf("%s-%s-%s", g.Comps[0], g.Comps[1], g.Comps[2])
+}
+
+type Comp struct {
+	Name  string
+	Conns map[string]*Comp
+}
+
+func NewComp(n string) *Comp {
+	return &Comp{Name: n, Conns: make(map[string]*Comp)}
+}
+
+func (c *Comp) Connect(o *Comp) {
+	c.Conns[o.Name] = o
+	o.Conns[c.Name] = c
+}
+
+func (c *Comp) FindFriends(o *Comp) []string {
+	var friends []string
+	checked := make(map[string]bool)
+	for name := range c.Conns {
+		if name == c.Name || name == o.Name {
+			continue
+		}
+		if _, ok := checked[name]; ok {
+			continue
+		}
+		if _, ok := o.Conns[name]; !ok {
+			continue
+		}
+		friends = append(friends, name)
+		checked[name] = true
+	}
+	return friends
+}
diff --git a/2024/day23/testinput b/2024/day23/testinput
new file mode 100644
index 0000000..3d49766
--- /dev/null
+++ b/2024/day23/testinput
@@ -0,0 +1,32 @@
+kh-tc
+qp-kh
+de-cg
+ka-co
+yn-aq
+qp-ub
+cg-tb
+vc-aq
+tb-ka
+wh-tc
+yn-cg
+kh-ub
+ta-co
+de-co
+tc-td
+tb-wq
+wh-td
+ta-ka
+td-qp
+aq-cg
+wq-ub
+ub-vc
+de-ta
+wq-aq
+wq-vc
+wh-yn
+ka-de
+kh-ta
+co-tc
+wh-qp
+tb-vc
+td-yn
diff --git a/helpers/set.go b/helpers/set.go
new file mode 100644
index 0000000..d94f5e6
--- /dev/null
+++ b/helpers/set.go
@@ -0,0 +1,72 @@
+package aoc
+
+import "slices"
+
+type Set map[string]bool
+
+func NewSet(l int) Set {
+	return make(map[string]bool, l)
+}
+
+func NewSetFromValues(v ...string) Set {
+	s := NewSet(len(v))
+	for _, val := range v {
+		s[val] = true
+	}
+	return s
+}
+
+func (s Set) Add(nm string) {
+	s[nm] = true
+}
+
+func (s Set) Remove(nm string) {
+	delete(s, nm)
+}
+
+func (s Set) Contains(nm string) bool {
+	_, ok := s[nm]
+	return ok
+}
+
+func (s Set) Empty() bool {
+	return len(s) == 0
+}
+
+func (s Set) Size() int {
+	return len(s)
+}
+
+func (s Set) Intersection(o Set) Set {
+	smallest, toCheck := s, o
+	if o.Size() < s.Size() {
+		smallest, toCheck = o, s
+	}
+	ix := NewSet(smallest.Size())
+	for nm := range smallest {
+		if toCheck.Contains(nm) {
+			ix.Add(nm)
+		}
+	}
+	return ix
+}
+
+func (s Set) Union(o Set) Set {
+	un := NewSet(s.Size() + o.Size())
+	for nm := range s {
+		un.Add(nm)
+	}
+	for nm := range o {
+		un.Add(nm)
+	}
+	return un
+}
+
+func (s Set) ToSortedSlice() []string {
+	sl := make([]string, 0, s.Size())
+	for nm := range s {
+		sl = append(sl, nm)
+	}
+	slices.Sort(sl)
+	return sl
+}