Day 3,4

8 files changed, 1433 insertions, 5 deletions

diff --git a/day2/solution.nim b/day2/solution.nim
index 8bbd95b..8a794d3 100644
--- a/day2/solution.nim
+++ b/day2/solution.nim
@@ -1,12 +1,10 @@
 import std/strutils
 import std/sequtils
-import std/tables
 
-let content = readFile("./input.txt").split("\n")
+let content = readFile("./input.txt").strip().split("\n")
 let rounds = map(
-    # Filter out empty lines
-    filter(content, proc(line: string): bool = not line.isEmptyOrWhitespace()),
-    # Split line into pair of strings
+    content,
+    # Split line into pair of characters
     proc(round: string): tuple[other: char, self: char] = 
        var splitted = round.split(" ")
        (splitted[0][0], splitted[1][0]))
diff --git a/day3/example.txt b/day3/example.txt
new file mode 100644
index 0000000..f17e726
--- /dev/null
+++ b/day3/example.txt
@@ -0,0 +1,6 @@
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diff --git a/day3/input.txt b/day3/input.txt
new file mode 100644
index 0000000..a30889c
--- /dev/null
+++ b/day3/input.txt
@@ -0,0 +1,300 @@
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diff --git a/day3/solution.nim b/day3/solution.nim
new file mode 100644
index 0000000..6df88f2
--- /dev/null
+++ b/day3/solution.nim
@@ -0,0 +1,47 @@
+import std/strutils
+import std/sequtils
+import std/sets
+
+proc Points(c: char): int =
+  if c.isLowerAscii():
+    return ord(c) - ord('a') + 1
+  else:
+    return ord(c) - ord('A') + 27
+
+proc part1(content: seq[string]): int =
+  let ruckshacks = map( content,
+      proc(line: string): tuple[first: string, second: string] = 
+        let pivot = int(line.len()/2)
+        (line[0 .. pivot-1], line[pivot .. ^1])
+    )
+
+  var score = 0
+  for ruckshack in ruckshacks:
+    let
+      uniqFirst = toHashSet(ruckshack.first)
+      uniqSecond = toHashSet(ruckshack.second)
+
+    var c = toSeq(uniqFirst * uniqSecond)[0]
+    score += Points(c)
+
+  return score
+
+proc part2(content: seq[string]): int =
+  assert(content.len() mod 3 == 0)
+ 
+  let ruckshacks = content
+  var score = 0
+  for i in countup(0, ruckshacks.len()-1, 3):
+    let 
+      uniqFirst = toHashSet(ruckshacks[i])
+      uniqSecond = toHashSet(ruckshacks[i+1])
+      uniqThird = toHashSet(ruckshacks[i+2])
+
+    var c = toSeq(uniqFirst * uniqSecond * uniqThird)[0]
+    score += Points(c)
+
+  return score
+
+let content = readFile("./input.txt").strip().split("\n")
+echo part1(content)
+echo part2(content)
diff --git a/day4/example.txt b/day4/example.txt
new file mode 100644
index 0000000..9f9e9cf
--- /dev/null
+++ b/day4/example.txt
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
diff --git a/day4/input.txt b/day4/input.txt
new file mode 100644
index 0000000..5304059
--- /dev/null
+++ b/day4/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/day4/solution.nim b/day4/solution.nim
new file mode 100644
index 0000000..36e90fb
--- /dev/null
+++ b/day4/solution.nim
@@ -0,0 +1,56 @@
+import std/strutils
+import std/sequtils
+
+type
+  # We use begin and length for Range representation to simplify calculations later
+  Range = tuple[begin: int, length: int]
+  Entry = tuple[first: Range, second: Range]
+
+proc part1(entries: seq[Entry]): int =
+  var score = 0
+  for e in entries:
+    var r: Entry
+    # Let first become the leftmost range. In case both ranges start at the same index, we consider the longest one to be first
+    if e.first.begin < e.second.begin or (e.first.begin == e.second.begin and e.first.length >= e.second.length):
+      r.first = e.first
+      r.second = e.second
+    else:
+      r.first = e.second
+      r.second = e.first
+
+    if r.first.length >= r.second.length + r.second.begin - r.first.begin:
+      score += 1
+
+  return score
+
+proc part2(entries: seq[Entry]): int =
+  var score = 0
+  for e in entries:
+    var r: Entry
+    # Let first become the leftmost range. In case both ranges start at the same index, we consider the longest one to be first
+    if e.first.begin < e.second.begin or (e.first.begin == e.second.begin and e.first.length >= e.second.length):
+      r.first = e.first
+      r.second = e.second
+    else:
+      r.first = e.second
+      r.second = e.first
+
+    if r.first.begin + r.first.length - 1 >= r.second.begin:
+      score += 1
+
+  return score
+
+let 
+  content = readFile("./input.txt").strip().splitLines()
+  entries = map(
+    content,
+    proc(line: string): Entry =
+      let tokens = map(line.split({',', '-'}), proc(token: string): int = token.parseInt())
+      (
+        (tokens[0], tokens[1] - tokens[0]+1),
+        (tokens[2], tokens[3] - tokens[2]+1)
+      )
+  )
+
+echo part1(entries)
+echo part2(entries)
diff --git a/init.sh b/init.sh
new file mode 100755
index 0000000..86273e5
--- /dev/null
+++ b/init.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+source ../cookie.sh
+
+if [ $# -eq 0 ]
+then
+  echo "No arguments provided."
+  exit 1
+fi
+
+DAY=$1
+DIR="day$DAY"
+echo "Initializing day $DAY in directory $DIR"
+
+mkdir -p $DIR && curl "https://adventofcode.com/2022/day/$DAY/input" -H "Cookie: session=$ADVENT_SESSION" > $DIR/input.txt
+touch $DIR/solution.nim