Initial data commit

Task/Move-to-front-algorithm/Nim/move-to-front-algorithm.nim

@@ -0,0 +1,22 @@
+import algorithm, sequtils, strformat
+
+const SymbolTable = toSeq('a'..'z')
+
+func encode(s: string): seq[int] =
+  var symtable: seq[char] = SymbolTable
+  for c in s:
+    let idx = symtable.find(c)
+    result.add idx
+    symtable.rotateLeft(0..idx, -1)
+
+func decode(s: seq[int]): string =
+  var symtable = SymbolTable
+  for idx in s:
+    result.add symtable[idx]
+    symtable.rotateLeft(0..idx, -1)
+
+for word in ["broood", "babanaaa", "hiphophiphop"]:
+  let encoded = word.encode()
+  let decoded = encoded.decode()
+  let status = if decoded == word: "correctly" else: "incorrectly"
+  echo &"'{word}' encodes to {encoded} which {status} decodes to '{decoded}'."