use scanf+tuples+arrays for day 2

README.md

@@ -10,6 +10,7 @@
 
 To generate a new day and fetch the input's for a puzzle use the below command.
 Note: the day and year are inferred from today's date if not specified.
+Set advent of code session cookie to `AOC_COOKIE` environment variable.
 
 ```sh
 nim r ./tools/aoc.nim # -d:1 -y:2023

config.nims

@@ -0,0 +1,5 @@
+import std/[algorithm,os,sequtils]
+
+task solve, "run all solutions":
+  for dir in walkDir("solutions").toSeq().sortedByIt(it.path):
+    selfExec "r --hint:all:off " & dir.path & "/solution.nim"

solutions/day02/example.txt

@@ -0,0 +1,5 @@
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green

solutions/day02/solution.nim

@@ -0,0 +1,59 @@
+import std/[strutils, strscans]
+
+const example* = slurp("example.txt").strip()
+const input* = slurp("input.txt").strip()
+
+type
+  Color {.pure.} = enum
+    red, blue, green
+
+  Cubes = array[Color, int]
+  Game = object
+    turns: seq[Cubes]
+
+proc parseInput(input: string): seq[Game] =
+  for line in input.splitLines:
+    result.add Game()
+    let turns = line.split(":")[1]
+    for turn in turns.split(";"):
+      var cubes: Cubes
+      for cubeStr in turn.split(","):
+        var cnt: int
+        var color: string
+        discard cubeStr.strip().scanf("$i $w", cnt, color)
+        cubes[parseEnum[Color](color)] = cnt
+      result[^1].turns.add cubes
+
+proc isValid(game: Game): bool =
+  const limits: Cubes = [red: 12, blue: 14, green: 13]
+  for turn in game.turns:
+    for col, cnt in turn:
+      if cnt > limits[col]:
+        return false
+  return true
+
+proc partOne*(input: string): int =
+  var games = parseInput(input)
+  for i, game in games:
+    if game.isValid():
+      result += (i+1)
+
+proc partTwo*(input: string): int =
+  var games = parseInput(input)
+  for i, game in games:
+    var mins: Cubes
+    for turn in game.turns:
+      for col, cnt in turn:
+        mins[col] = max(mins[col], cnt)
+    result += mins[red] * mins[green] * mins[blue]
+
+
+when isMainModule:
+  import std/unittest
+  suite "day 2":
+    test "part one":
+      check partOne(example) == 8
+      check partOne(input) == 2239
+    test "part two":
+      check partTwo(example) == 2286
+      check partTwo(input) == 83435

tools/aoc.nim

@@ -18,7 +18,7 @@ proc getInput(year, day: int): string =
   return response.body().strip()
 
 proc skeleton(day: int) =
-  const solution = """
+  let solution = fmt"""
 import std/[strutils]
 
 const example* = slurp("example.txt").strip()