2023: day 1!

2023/.gitignore

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+input

2023/day01/d01_1.nim

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+import std/[math, sequtils, strutils]
+
+proc calibrationValue*(line: string): int =
+  var digits: seq[char]
+  for ch in line:
+    if ch.isDigit():
+      digits.add(ch)
+  result = parseInt(digits[0] & digits[^1])
+
+when isMainModule:
+  var input = stdin.readAll().strip().splitLines()
+  echo input.map(calibrationValue).sum()

2023/day01/d01_2.nim

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+import std/[math, sequtils, strutils]
+import d01_1
+
+func calcDigitLookup(): seq[(string, string)] =
+  let digits = {
+    "one": "1",
+    "two": "2",
+    "three": "3",
+    "four": "4",
+    "five": "5",
+    "six": "6",
+    "seven": "7",
+    "eight": "8",
+    "nine": "9"
+  }
+  for (k1, v1) in digits:
+    for (k2, v2) in digits:
+      if k1[^1] == k2[0]:
+        result.add((k1[0..^2] & k2, v1 & v2))
+  result & @digits
+
+const digits = calcDigitLookup()
+
+when isMainModule:
+  let
+    input = stdin.readAll().strip()
+    realInput = input.multiReplace(digits)
+    lines = realInput.splitLines()
+  echo lines.map(calibrationValue).sum()