Add day7 problem + solution

day7/p1.nim

@@ -0,0 +1,23 @@
+import os
+import std/[strutils, sequtils, algorithm]
+
+
+proc main() =
+  # initial idea is to sort input and 
+  let fileName = paramStr(1)
+  let f = open(fileName, fmRead)
+
+  var crabs = f.readLine().split(",").mapIt(it.strip.parseInt)
+
+  f.close()
+
+  crabs.sort(cmp)
+
+  let median = crabs[(crabs.len/2).int]
+  echo median
+
+  let fuel = crabs.mapIt(abs(it-median)).foldl(a+b)
+
+  echo "Min fuel: ", fuel
+
+main()