Day Four

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diff --git a/2022/nim/day04/src/main.nim b/2022/nim/day04/src/main.nim
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+# Day 4: Camp Cleanup
+import std/[os, strutils, sequtils, sugar]
+
+let input = paramStr(1).readFile().strip().split("\n")
+
+let assign = input.mapIt(it.split(","))
+  .mapIt(it.mapIt(it.split("-").map(parseInt)))
+
+func contains(a, b: seq[int]): bool =
+  return a[0] in b[0] .. b[1] and
+         a[1] in b[0] .. b[1] or
+         b[0] in a[0] .. a[1] and
+         b[1] in a[0] .. a[1]
+
+echo assign.filterIt(contains(it[0], it[1])).len
+
+func overlaps(a, b: seq[int]): bool =
+  return a[0] in b[0] .. b[1] or
+         a[1] in b[0] .. b[1] or
+         b[0] in a[0] .. a[1] or
+         b[1] in a[0] .. a[1]
+
+echo assign.filterIt(overlaps(it[0], it[1])).len