Day 4

day_01/solve.nim

@@ -0,0 +1,31 @@
+import std/[strutils, sequtils, sugar, algorithm]
+
+iterator parseElves(data: seq[string]): seq[string] =
+  var items = newSeq[string]()
+  for line in data:
+    if line.isEmptyOrWhitespace:
+      yield items
+      items.setLen 0
+    else:
+      items.add(line)
+
+const lines = readFile("day_01/day_01_input.txt").splitLines
+
+proc solveMostCalories() =
+  var mostCalories = 0
+  for item in parseElves(lines):
+    mostCalories = max(mostCalories, item.map(it => it.parseInt).foldl(a + b))
+  echo "Most calories: " & $mostCalories
+
+proc solveTop3() =
+  var allElves = newSeq[int]()
+  for inventory in parseElves(lines):
+    allElves.add(inventory.map(it => it.parseInt).foldl(a + b))
+  allElves.sort(SortOrder.Descending)
+  allElves.setLen(3)
+  let top3Calories = allElves.foldl(a + b)
+  echo "Top 3 calories: " & $top3Calories
+
+if isMainModule:
+  solveMostCalories()
+  solveTop3()