From 1859239c3671f8bfa3c6e6c18e8ddb8fae38e388 Mon Sep 17 00:00:00 2001
From: Stefan Harmuth <stefan.harmuth@docomodigital.com>
Date: Sun, 17 Jan 2021 08:23:03 +0100
Subject: [PATCH] day06

---
 day05/day.go  | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++
 inputs/5      |  1 +
 inputs/5_test |  1 +
 main.go       |  7 ++++++-
 4 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 day05/day.go
 create mode 100644 inputs/5
 create mode 100644 inputs/5_test

diff --git a/day05/day.go b/day05/day.go
new file mode 100644
index 0000000..229442e
--- /dev/null
+++ b/day05/day.go
@@ -0,0 +1,52 @@
+package day05
+
+import (
+	"crypto/md5"
+	"fmt"
+	"strconv"
+	"tools"
+)
+
+func Part1(puzzle tools.AoCPuzzle) interface{} {
+	doorId := puzzle.GetInputArray()[0]
+	password := ""
+	i := 0
+
+	for {
+		chk := doorId + strconv.Itoa(i)
+		chksum := fmt.Sprintf("%x", md5.Sum([]byte(chk)))
+		if chksum[0:5] == "00000" {
+			password += string(chksum[5])
+		}
+		if len(password) == 8 {
+			break
+		}
+		i++
+	}
+
+	return password
+}
+
+func Part2(puzzle tools.AoCPuzzle) interface{} {
+	doorId := puzzle.GetInputArray()[0]
+	password := make([]byte, 8)
+	i := 0
+	cCount := 0
+
+	for {
+		chk := doorId + strconv.Itoa(i)
+		chksum := fmt.Sprintf("%x", md5.Sum([]byte(chk)))
+		if chksum[0:5] == "00000" {
+			if chksum[5] >= '0' && chksum[5] <= '7' && password[chksum[5]-48] == 0 {
+				password[chksum[5]-48] = chksum[6]
+				cCount++
+			}
+		}
+		if cCount == 8 {
+			break
+		}
+		i++
+	}
+
+	return string(password)
+}
diff --git a/inputs/5 b/inputs/5
new file mode 100644
index 0000000..d152446
--- /dev/null
+++ b/inputs/5
@@ -0,0 +1 @@
+wtnhxymk
\ No newline at end of file
diff --git a/inputs/5_test b/inputs/5_test
new file mode 100644
index 0000000..f2ba8f8
--- /dev/null
+++ b/inputs/5_test
@@ -0,0 +1 @@
+abc
\ No newline at end of file
diff --git a/main.go b/main.go
index 2373deb..b3b06bc 100644
--- a/main.go
+++ b/main.go
@@ -5,6 +5,7 @@ import (
 	"aoc2016/day02"
 	"aoc2016/day03"
 	"aoc2016/day04"
+	"aoc2016/day05"
 	"flag"
 	"fmt"
 	"os"
@@ -26,7 +27,7 @@ func initDayFunctions() {
 		2: {1: day02.Part1, 2: day02.Part2},
 		3: {1: day03.Part1, 2: day03.Part2},
 		4: {1: day04.Part1, 2: day04.Part2},
-		//		5:  {1: day05.Part1, 2: day05.Part2},
+		5: {1: day05.Part1, 2: day05.Part2},
 		//		6:  {1: day06.Part1, 2: day06.Part2},
 		//		7:  {1: day07.Part1, 2: day07.Part2},
 		//		8:  {1: day08.Part1, 2: day08.Part2},
@@ -43,6 +44,10 @@ func initDayFunctions() {
 		//		19: {1: day19.Part1, 2: day19.Part2},
 		//		20: {1: day20.Part1, 2: day20.Part2},
 		//		21: {1: day21.Part1, 2: day21.Part2},
+		//		22: {1: day22.Part1, 2: day22.Part2},
+		//		23: {1: day23.Part1, 2: day23.Part2},
+		//		24: {1: day24.Part1, 2: day24.Part2},
+		//		25: {1: day25.Part1, 2: day25.Part2},
 	}
 }