Just another update

Task/Non-continuous-subsequences/Seed7/non-continuous-subsequences.seed7

@@ -0,0 +1,30 @@
+$ include "seed7_05.s7i";
+
+const func array bitset: ncsub (in bitset: seq, in integer: s) is func
+  result
+    var array bitset: subseq is 0 times {};
+  local
+    var bitset: x is {};
+    var bitset: xs is {};
+    var bitset: ys is {};
+  begin
+    if seq <> {} then
+      x := {min(seq)};
+      xs := seq - x;
+      for ys range ncsub(xs, s + 1 - s rem 2) do
+        subseq &:= x | ys;
+      end for;
+      subseq &:= ncsub(xs, s + s rem 2);
+    elsif s >= 3 then
+      subseq &:= {};
+    end if;
+  end func;
+
+const proc: main is func
+  local
+    var bitset: seq is {};
+  begin
+    for seq range ncsub({1, 2, 3, 4}, 0) do
+      writeln(seq);
+    end for;
+  end func;