Solve a few problems

04_fib/fib.nim

@@ -0,0 +1,16 @@
+import os
+import std/strutils
+
+let n = parseInt(paramStr(1))
+let k = parseInt(paramStr(2))
+
+var adultPairs = 0
+var newbornPairs = 1
+
+for i in 1 ..< n:
+    var adultPrevPairs = adultPairs
+    adultPairs = adultPairs + newbornPairs
+    newbornPairs = k*adultPrevPairs
+
+let pairs = adultPairs + newbornPairs
+echo $pairs

04_fib/rosalind_fib.txt

@@ -0,0 +1 @@
+32 5