Add tasks for all the new languages

Task/Executable-library/Nim/executable-library-1.nim

@@ -0,0 +1,20 @@
+proc hailstone*(n): auto =
+  result = @[n]
+  var n = n
+  while n > 1:
+    if (n and 1) == 1:
+      n = 3 * n + 1
+    else:
+      n = n div 2
+    result.add n
+
+when isMainModule:
+  let h = hailstone 27
+  assert h.len == 112 and h[0..3] == @[27,82,41,124] and h[h.high-3..h.high] == @[8,4,2,1]
+  var m, mi = 0
+  for i in 1 .. <100_000:
+    let n = hailstone(i).len
+    if n > m:
+      m = n
+      mi = i
+  echo "Maximum length ", m, " was found for hailstone(", mi, ") for numbers <100,000"

Task/Executable-library/Nim/executable-library-2.nim

@@ -0,0 +1,10 @@
+import hailstone, tables
+
+var t = initCountTable[int]()
+
+for i in 1 .. <100_000:
+  t.inc(hailstone(i).len)
+
+let (val, cnt) = t.largest()
+echo "The length of hailstone sequence that is most common for"
+echo "hailstone(n) where 1<=n<100000, is ", val, ". It occurs ", cnt, " times."

Task/Executable-library/Sidef/executable-library-1.sidef

@@ -0,0 +1,26 @@
+func hailstone(n) {
+    gather {
+        while (n > 1) {
+            take(n)
+            n = (n.is_even ? n/2 : (3*n + 1))
+        }
+        take(1)
+    }
+}
+ 
+if (__FILE__ == __MAIN__) {             # true when not imported
+    var seq = hailstone(27)
+    say "hailstone(27) - #{seq.len} elements: #{seq.ft(0, 3)} [...] #{seq.ft(-4)}"
+ 
+    var n = 0
+    var max = 0
+    100_000.times { |i|
+        var seq = hailstone(i)
+        if (seq.len > max) {
+            max = seq.len
+            n = i
+        }
+    }
+ 
+    say "Longest sequence is for #{n}: #{max}"
+}

Task/Executable-library/Sidef/executable-library-2.sidef

@@ -0,0 +1 @@
+$ sidef Hailstone.sm

Task/Executable-library/Sidef/executable-library-3.sidef

@@ -0,0 +1,7 @@
+include Hailstone
+ 
+var score = Hash()
+100_000.times { |i| score{ Hailstone::hailstone(i).len } := 0 ++ }
+ 
+var k = score.keys.max_by {|k| score{k} }
+say "Most common length is #{k}, occurring #{score{k}} times"

Task/Executable-library/Sidef/executable-library-4.sidef

@@ -0,0 +1 @@
+$ sidef test_hailstone.sf