feat: solve day 8 part 2...we in this bitch

cmd/08/main.go

@@ -9,6 +9,50 @@ import (
 	"github.com/StevanFreeborn/advent-of-code-2025/internal/queue"
 )
 
+func SolvePartTwo(filePath string) int {
+	boxes := []box.Box{}
+
+	for line := range file.ReadLines(filePath) {
+		boxes = append(boxes, box.From(line))
+	}
+
+	estimator := estimator.From(boxes)
+	circuitsMap := estimator.CreateMap()
+
+	numberOfSets := len(boxes)
+
+	for _, connection := range estimator.PossibleConnections() {
+		startRoot := circuitsMap.FindRootBoxFor(connection.Start())
+		endRoot := circuitsMap.FindRootBoxFor(connection.End())
+
+		if startRoot == endRoot {
+			continue
+		}
+
+		startRootValue, _ := circuitsMap.GetValueFor(startRoot)
+		endRootValue, _ := circuitsMap.GetValueFor(endRoot)
+
+		if startRootValue.Size() < endRootValue.Size() {
+			startRootValue.UpdateParent(endRoot)
+			endRootValue.IncreaseSize(startRootValue.Size())
+		} else {
+			endRootValue.UpdateParent(startRoot)
+			startRootValue.IncreaseSize(endRootValue.Size())
+		}
+
+		circuitsMap.UpdateValueFor(startRoot, startRootValue)
+		circuitsMap.UpdateValueFor(endRoot, endRootValue)
+
+		numberOfSets--
+
+		if numberOfSets == 1 {
+			return connection.Start().X() * connection.End().X()
+		}
+	}
+
+	return -1
+}
+
 func SolvePartOne(filePath string, numOfConnections int) int {
 	boxes := []box.Box{}
 

cmd/08/main_test.go

@@ -17,7 +17,7 @@ func TestSolvePartOneWithExampleInput(t *testing.T) {
 }
 
 func TestSolvePartOneWithInput(t *testing.T) {
-	expected := 62186
+	expected := 62_186
 
 	result := solution.SolvePartOne("INPUT.txt", 1000)
 
@@ -37,7 +37,7 @@ func TestSolvePartOneAgainWithExampleInput(t *testing.T) {
 }
 
 func TestSolvePartOneAgainWithInput(t *testing.T) {
-	expected := 62186
+	expected := 62_186
 
 	result := solution.SolvePartOneAgain("INPUT.txt", 1000)
 
@@ -45,3 +45,23 @@ func TestSolvePartOneAgainWithInput(t *testing.T) {
 		t.Errorf("SolvePartOneAgain returned %d, expected %d", result, expected)
 	}
 }
+
+func TestSolvePartTwoWithExampleInput(t *testing.T) {
+	expected := 25_272
+
+	result := solution.SolvePartTwo("EXAMPLE.txt")
+
+	if result != expected {
+		t.Errorf("SolvePartTwo returned %d, expected %d", result, expected)
+	}
+}
+
+func TestSolvePartTwoWithInput(t *testing.T) {
+	expected := 8_420_405_530
+
+	result := solution.SolvePartTwo("INPUT.txt")
+
+	if result != expected {
+		t.Errorf("SolvePartTwo returned %d, expected %d", result, expected)
+	}
+}