From b2faced8a9835d9af6d2d032fa1df079ae084b39 Mon Sep 17 00:00:00 2001
From: Stefan Harmuth <stefan.harmuth@docomodigital.com>
Date: Thu, 21 Jan 2021 07:54:09 +0100
Subject: [PATCH] day06

---
 day06/day.go  |  57 +++++
 inputs/6      | 572 ++++++++++++++++++++++++++++++++++++++++++++++++++
 inputs/6_test |  16 ++
 main.go       |   3 +-
 4 files changed, 647 insertions(+), 1 deletion(-)
 create mode 100644 day06/day.go
 create mode 100644 inputs/6
 create mode 100644 inputs/6_test

diff --git a/day06/day.go b/day06/day.go
new file mode 100644
index 0000000..1e031b0
--- /dev/null
+++ b/day06/day.go
@@ -0,0 +1,57 @@
+package day06
+
+import (
+	"math"
+	"tools"
+)
+
+func getCharCounterSet(input []string) []tools.CounterSet {
+	charcounts := make([]tools.CounterSet, len(input[0]))
+	for i := range charcounts {
+		charcounts[i] = tools.NewCounterSet()
+	}
+
+	for _, line := range input {
+		for i, c := range line {
+			charcounts[i].Add(byte(c), 1)
+		}
+	}
+
+	return charcounts
+}
+
+func Part1(puzzle tools.AoCPuzzle) interface{} {
+	transmission := puzzle.GetInputArray()
+	answer := make([]byte, len(transmission[0]))
+	charcounts := getCharCounterSet(transmission)
+
+	for i, s := range charcounts {
+		maxCount := 0
+		for _, c := range s.Keys() {
+			if s.Get(c) > maxCount {
+				maxCount = s.Get(c)
+				answer[i] = c.(byte)
+			}
+		}
+	}
+
+	return string(answer)
+}
+
+func Part2(puzzle tools.AoCPuzzle) interface{} {
+	transmission := puzzle.GetInputArray()
+	answer := make([]byte, len(transmission[0]))
+	charcounts := getCharCounterSet(transmission)
+
+	for i, s := range charcounts {
+		minCount := math.MaxInt16
+		for _, c := range s.Keys() {
+			if s.Get(c) < minCount {
+				minCount = s.Get(c)
+				answer[i] = c.(byte)
+			}
+		}
+	}
+
+	return string(answer)
+}
diff --git a/inputs/6 b/inputs/6
new file mode 100644
index 0000000..fe6bcdf
--- /dev/null
+++ b/inputs/6
@@ -0,0 +1,572 @@
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\ No newline at end of file
diff --git a/inputs/6_test b/inputs/6_test
new file mode 100644
index 0000000..573a180
--- /dev/null
+++ b/inputs/6_test
@@ -0,0 +1,16 @@
+eedadn
+drvtee
+eandsr
+raavrd
+atevrs
+tsrnev
+sdttsa
+rasrtv
+nssdts
+ntnada
+svetve
+tesnvt
+vntsnd
+vrdear
+dvrsen
+enarar
\ No newline at end of file
diff --git a/main.go b/main.go
index b3b06bc..06fb1c2 100644
--- a/main.go
+++ b/main.go
@@ -6,6 +6,7 @@ import (
 	"aoc2016/day03"
 	"aoc2016/day04"
 	"aoc2016/day05"
+	"aoc2016/day06"
 	"flag"
 	"fmt"
 	"os"
@@ -28,7 +29,7 @@ func initDayFunctions() {
 		3: {1: day03.Part1, 2: day03.Part2},
 		4: {1: day04.Part1, 2: day04.Part2},
 		5: {1: day05.Part1, 2: day05.Part2},
-		//		6:  {1: day06.Part1, 2: day06.Part2},
+		6: {1: day06.Part1, 2: day06.Part2},
 		//		7:  {1: day07.Part1, 2: day07.Part2},
 		//		8:  {1: day08.Part1, 2: day08.Part2},
 		//		9:  {1: day09.Part1, 2: day09.Part2},