add day 1 solution

day01/part1.nim

@@ -0,0 +1,21 @@
+import strutils
+
+proc countIncreases(): uint =
+  var
+    line = ""
+    prevDepth = high(uint)
+  while readLine(stdin, line):
+    if line.len() > 0:
+      let depth = parseUint(line)
+      if depth > prevDepth:
+        result.inc()
+      prevDepth = depth
+
+proc main(): int =
+  try:
+    echo countIncreases()
+  except ValueError:
+    result = -1
+
+when isMainModule:
+  quit(main())

day01/part2.nim

@@ -0,0 +1,25 @@
+import algorithm
+import math
+import strutils
+
+const WindowSize = 3
+
+proc countIncreases(): uint =
+  var
+    line = ""
+    window: array[WindowSize + 1, uint]
+  while readLine(stdin, line):
+    if line.len() > 0:
+      window.rotateLeft(1)
+      window[^1] = parseUint(line)
+      if window[0] > 0 and sum(window[1 .. ^1]) > sum(window[0 .. ^2]):
+        result.inc()
+
+proc main(): int =
+  try:
+    echo countIncreases()
+  except ValueError:
+    result = -1
+
+when isMainModule:
+  quit(main())

day01/testinput

@@ -0,0 +1,10 @@
+199
+200
+208
+210
+200
+207
+240
+269
+260
+263