Part 1

day1/p1.nim

@@ -0,0 +1,22 @@
+import os
+import std/strutils
+
+proc main() =
+  let fileName = paramStr(1)
+
+  var maxSum = 0
+
+  var curSum = 0
+
+  for line in fileName.lines:
+    if line.len == 0:
+      maxSum = max(curSum, maxSum)
+      curSum = 0
+      continue
+
+    curSum += line.parseInt
+
+  echo maxSum
+
+
+main()

day1/p2.nim

@@ -0,0 +1,36 @@
+import os, math
+import std/strutils
+
+proc main() =
+  let fileName = paramStr(1)
+
+  var maxSumArray = [0,0,0]
+
+  var curSum = 0
+
+  for line in fileName.lines:
+    if line.len == 0:
+      if curSum > maxSumArray[0]:
+        let temp = maxSumArray[0]
+        # bubble down
+        maxSumArray[0] = curSum
+        maxSumArray[2] = maxSumArray[1]
+        maxSumArray[1] = temp
+      elif curSum > maxSumArray[1]:
+        let temp = maxSumArray[1]
+        # bubble down
+        maxSumArray[1] = curSum
+        maxSumArray[2] = temp
+      elif curSum > maxSumArray[2]:
+        maxSumArray[2] = curSum
+
+      curSum = 0
+      continue
+
+    curSum += line.parseInt
+
+  echo maxSumArray
+  echo sum(maxSumArray)
+
+
+main()