day02

2022/day02/day02.nim

@@ -0,0 +1,39 @@
+import std/[strutils, sugar, tables]
+
+type
+  Shape = ref object
+    loses: Shape
+    beats: Shape
+    score: int
+
+let rock = Shape(score: 1)
+let paper = Shape(beats: rock, score: 2)
+rock.loses = paper
+let scissors = Shape(loses: rock, beats: paper, score: 3)
+rock.beats = scissors
+paper.loses = scissors
+
+let charToMove =
+  { "A": rock
+  , "B": paper
+  , "C": scissors
+  , "X": rock
+  , "Y": paper
+  , "Z": scissors
+  }.toTable
+
+let input = readAll(stdin).strip().split('\n')
+let rounds = collect:
+  for game in input:
+    let s = game.split(' ')
+    (charToMove[s[0]], charToMove[s[1]])
+
+var score = 0
+for (opponent, me) in rounds:
+  score += me.score
+  if me.beats == opponent:
+    score += 6
+  elif me == opponent:
+    score += 3
+
+echo score

2022/day02/day02_2.nim

@@ -0,0 +1,47 @@
+import std/[strutils, sugar, tables]
+
+type
+  Shape = ref object
+    loses: Shape
+    beats: Shape
+    score: int
+  Strat = enum Lose, Draw, Win
+
+let rock = Shape(score: 1)
+let paper = Shape(beats: rock, score: 2)
+rock.loses = paper
+let scissors = Shape(loses: rock, beats: paper, score: 3)
+rock.beats = scissors
+paper.loses = scissors
+
+let charToMove =
+  { "A": rock
+  , "B": paper
+  , "C": scissors
+  }.toTable
+
+let charToStrat =
+  { "X": Lose
+  , "Y": Draw
+  , "Z": Win
+  }.toTable
+
+let input = readAll(stdin).strip().split('\n')
+let rounds = collect:
+  for game in input:
+    let s = game.split(' ')
+    (charToMove[s[0]], charToStrat[s[1]])
+
+var score = 0
+for (opponent, strat) in rounds:
+  case strat
+  of Lose:
+    score += opponent.beats.score
+  of Draw:
+    score += opponent.score
+    score += 3
+  of Win:
+    score += opponent.loses.score
+    score += 6
+
+echo score