2022/02/first.nim

@@ -0,0 +1,43 @@
+import
+  std/strformat,
+  std/strutils,
+  std/tables
+
+import
+  ../../adventofcode
+
+let input = adventofcode.getInput()
+
+var score = 0
+
+type
+  Choices = enum
+    rock, paper, scissors
+
+let choices = toTable({
+  'A': rock,
+  'B': paper,
+  'C': scissors,
+  'X': rock,
+  'Y': paper,
+  'Z': scissors,
+})
+
+for line in input.splitLines:
+  let opponentChoice = choices[line[0]]
+  let ourChoice = choices[line[2]]
+
+  # The choice we make is added to the score
+  score += 1 + ord ourChoice
+
+  let outcome = ord(ourChoice) - ord(opponentChoice)
+  case outcome
+  of -2: score += 6
+  of -1: score += 0
+  of 0: score += 3
+  of 1: score += 6
+  of 2: score += 0
+  else:
+    raise newException(ValueError, fmt"Outcome: {outcome}")
+
+echo fmt"Answer: {score}"

2022/02/second.nim

@@ -0,0 +1,60 @@
+import
+  std/strformat,
+  std/strutils,
+  std/tables
+
+import
+  ../../adventofcode
+
+let input = adventofcode.getInput()
+
+var score = 0
+
+type
+  Choice = enum
+    cRock = 'A',
+    cPaper = 'B',
+    cScissors = 'C'
+  RequiredOutcome = enum
+    roDefeat = 'X',
+    roDraw = 'Y',
+    roVictory = 'Z'
+
+let choiceScores = toTable({
+  cRock: 1,
+  cPaper: 2,
+  cScissors: 3,
+})
+
+for line in input.splitLines:
+  let opponentChoice = Choice line[0]
+  let requiredOutcome = RequiredOutcome line[2]
+  var ourChoice: Choice
+  
+  case requiredOutcome
+  of roDefeat:
+    score += 0
+    case opponentChoice
+    of cRock:
+      ourChoice = cScissors
+    of cPaper:
+      ourChoice = cRock
+    of cScissors:
+      ourChoice = cPaper
+  of roDraw:
+    score += 3
+    ourChoice = opponentChoice
+  of roVictory:
+    score += 6
+    case opponentChoice
+    of cRock:
+      ourChoice = cPaper
+    of cPaper:
+      ourChoice = cScissors
+    of cScissors:
+      ourChoice = cRock
+
+  # The choice we make is added to the score
+  score += choiceScores[ourChoice]
+
+echo fmt"Answer: {score}"