day13 - almost the same as day09 :/

day13/day.go

@@ -0,0 +1,102 @@
+package day13
+
+import (
+	"math"
+	"strconv"
+	"strings"
+	"tools"
+)
+
+func getMoodMap(input []string, addYourself bool) ([]string, map[string]map[string]int) {
+	moodMap := make(map[string]map[string]int)
+	var people []string
+
+	for _, line := range input {
+		moodDescr := strings.Split(line, " ")
+		person1 := moodDescr[0]
+		person2 := moodDescr[10][:len(moodDescr[10])-1]
+		moodSwing, _ := strconv.Atoi(moodDescr[3])
+		if moodDescr[2] == "lose" {
+			moodSwing = -moodSwing
+		}
+
+		if _, ok := moodMap[person1]; !ok {
+			moodMap[person1] = make(map[string]int)
+			people = append(people, person1)
+		}
+		moodMap[person1][person2] = moodSwing
+	}
+
+	if addYourself {
+		people = append(people, "myself")
+	}
+
+	return people, moodMap
+}
+
+func seatingPermutations(slice []string) (permutations [][]string) {
+	if len(slice) == 1 {
+		return [][]string{slice}
+	} else if len(slice) == 2 {
+		return [][]string{
+			{
+				slice[0],
+				slice[1],
+			},
+			{
+				slice[1],
+				slice[0],
+			},
+		}
+	} else {
+		for i := range slice {
+			newSlice := make([]string, i)
+			copy(newSlice, slice[:i])
+			newSlice = append(newSlice, slice[i+1:]...)
+			subPermutations := seatingPermutations(newSlice)
+			for _, subPermutation := range subPermutations {
+				permutations = append(permutations, append([]string{slice[i]}, subPermutation...))
+			}
+		}
+		return permutations
+	}
+}
+
+func getMinMaxMoods(permutations [][]string, moodMap map[string]map[string]int) (int, int) {
+	minMood := math.MaxInt32
+	maxMood := 0
+
+	for _, v := range permutations {
+		thisMood := 0
+		for i := 0; i < len(v); i++ {
+			j := i + 1
+			if j == len(v) {
+				j = 0
+			}
+			thisMood += moodMap[v[i]][v[j]]
+			thisMood += moodMap[v[j]][v[i]]
+		}
+		if thisMood < minMood {
+			minMood = thisMood
+		}
+		if thisMood > maxMood {
+			maxMood = thisMood
+		}
+	}
+
+	return minMood, maxMood
+}
+
+func Part1(puzzle tools.AoCPuzzle) interface{} {
+	people, moodMap := getMoodMap(puzzle.GetInputArray(), false)
+	_, maxMood := getMinMaxMoods(seatingPermutations(people), moodMap)
+
+	return maxMood
+}
+
+func Part2(puzzle tools.AoCPuzzle) interface{} {
+	people, moodMap := getMoodMap(puzzle.GetInputArray(), true)
+	_, maxMood := getMinMaxMoods(seatingPermutations(people), moodMap)
+
+	return maxMood
+}

inputs/13

@@ -0,0 +1,56 @@
+Alice would lose 2 happiness units by sitting next to Bob.
+Alice would lose 62 happiness units by sitting next to Carol.
+Alice would gain 65 happiness units by sitting next to David.
+Alice would gain 21 happiness units by sitting next to Eric.
+Alice would lose 81 happiness units by sitting next to Frank.
+Alice would lose 4 happiness units by sitting next to George.
+Alice would lose 80 happiness units by sitting next to Mallory.
+Bob would gain 93 happiness units by sitting next to Alice.
+Bob would gain 19 happiness units by sitting next to Carol.
+Bob would gain 5 happiness units by sitting next to David.
+Bob would gain 49 happiness units by sitting next to Eric.
+Bob would gain 68 happiness units by sitting next to Frank.
+Bob would gain 23 happiness units by sitting next to George.
+Bob would gain 29 happiness units by sitting next to Mallory.
+Carol would lose 54 happiness units by sitting next to Alice.
+Carol would lose 70 happiness units by sitting next to Bob.
+Carol would lose 37 happiness units by sitting next to David.
+Carol would lose 46 happiness units by sitting next to Eric.
+Carol would gain 33 happiness units by sitting next to Frank.
+Carol would lose 35 happiness units by sitting next to George.
+Carol would gain 10 happiness units by sitting next to Mallory.
+David would gain 43 happiness units by sitting next to Alice.
+David would lose 96 happiness units by sitting next to Bob.
+David would lose 53 happiness units by sitting next to Carol.
+David would lose 30 happiness units by sitting next to Eric.
+David would lose 12 happiness units by sitting next to Frank.
+David would gain 75 happiness units by sitting next to George.
+David would lose 20 happiness units by sitting next to Mallory.
+Eric would gain 8 happiness units by sitting next to Alice.
+Eric would lose 89 happiness units by sitting next to Bob.
+Eric would lose 69 happiness units by sitting next to Carol.
+Eric would lose 34 happiness units by sitting next to David.
+Eric would gain 95 happiness units by sitting next to Frank.
+Eric would gain 34 happiness units by sitting next to George.
+Eric would lose 99 happiness units by sitting next to Mallory.
+Frank would lose 97 happiness units by sitting next to Alice.
+Frank would gain 6 happiness units by sitting next to Bob.
+Frank would lose 9 happiness units by sitting next to Carol.
+Frank would gain 56 happiness units by sitting next to David.
+Frank would lose 17 happiness units by sitting next to Eric.
+Frank would gain 18 happiness units by sitting next to George.
+Frank would lose 56 happiness units by sitting next to Mallory.
+George would gain 45 happiness units by sitting next to Alice.
+George would gain 76 happiness units by sitting next to Bob.
+George would gain 63 happiness units by sitting next to Carol.
+George would gain 54 happiness units by sitting next to David.
+George would gain 54 happiness units by sitting next to Eric.
+George would gain 30 happiness units by sitting next to Frank.
+George would gain 7 happiness units by sitting next to Mallory.
+Mallory would gain 31 happiness units by sitting next to Alice.
+Mallory would lose 32 happiness units by sitting next to Bob.
+Mallory would gain 95 happiness units by sitting next to Carol.
+Mallory would gain 91 happiness units by sitting next to David.
+Mallory would lose 66 happiness units by sitting next to Eric.
+Mallory would lose 75 happiness units by sitting next to Frank.
+Mallory would lose 99 happiness units by sitting next to George.

inputs/13_test

@@ -0,0 +1,12 @@
+Alice would gain 54 happiness units by sitting next to Bob.
+Alice would lose 79 happiness units by sitting next to Carol.
+Alice would lose 2 happiness units by sitting next to David.
+Bob would gain 83 happiness units by sitting next to Alice.
+Bob would lose 7 happiness units by sitting next to Carol.
+Bob would lose 63 happiness units by sitting next to David.
+Carol would lose 62 happiness units by sitting next to Alice.
+Carol would gain 60 happiness units by sitting next to Bob.
+Carol would gain 55 happiness units by sitting next to David.
+David would gain 46 happiness units by sitting next to Alice.
+David would lose 7 happiness units by sitting next to Bob.
+David would gain 41 happiness units by sitting next to Carol.

main.go

@@ -13,6 +13,7 @@ import (
 	"aoc2015/day10"
 	"aoc2015/day11"
 	"aoc2015/day12"
+	"aoc2015/day13"
 	"flag"
 	"fmt"
 	"os"
@@ -42,6 +43,7 @@ func initDayFunctions() {
 		10: {1: day10.Part1, 2: day10.Part2},
 		11: {1: day11.Part1, 2: day11.Part2},
 		12: {1: day12.Part1, 2: day12.Part2},
+		13: {1: day13.Part1, 2: day13.Part2},
 	}
 }