Sync

Task/Sorting-algorithms-Strand-sort/D/sorting-algorithms-strand-sort-1.d

@@ -0,0 +1,44 @@
+import std.stdio, std.container;
+
+DList!T strandSort(T)(DList!T list) {
+    static DList!T merge(DList!T left, DList!T right) {
+        DList!T result;
+        while (!left.empty && !right.empty) {
+            if (left.front <= right.front) {
+                result.insertBack(left.front);
+                left.removeFront();
+            } else {
+                result.insertBack(right.front);
+                right.removeFront();
+            }
+        }
+        result.insertBack(left[]);
+        result.insertBack(right[]);
+        return result;
+    }
+
+    DList!T result, sorted, leftover;
+
+    while (!list.empty) {
+        leftover.clear();
+        sorted.clear();
+        sorted.insertBack(list.front);
+        list.removeFront();
+        foreach (item; list) {
+            if (sorted.back <= item)
+                sorted.insertBack(item);
+            else
+                leftover.insertBack(item);
+        }
+        result = merge(sorted, result);
+        list = leftover;
+    }
+
+    return result;
+}
+
+void main() {
+    auto lst = DList!int([-2,0,-2,5,5,3,-1,-3,5,5,0,2,-4,4,2]);
+    foreach (e; strandSort(lst))
+        write(e, " ");
+}

Task/Sorting-algorithms-Strand-sort/D/sorting-algorithms-strand-sort-2.d

@@ -0,0 +1,35 @@
+import std.stdio, std.array;
+
+T[] strandSort(T)(/*in*/ T[] list) pure nothrow {
+    static T[] merge(T[] left, T[] right) pure nothrow {
+        T[] res;
+        while (!left.empty && !right.empty) {
+            if (left.front <= right.front) {
+                res ~= left.front;
+                left.popFront;
+            } else {
+                res ~= right.front;
+                right.popFront;
+            }
+        }
+        return res ~ left ~ right;
+    }
+
+    T[] result;
+    while (!list.empty) {
+        auto sorted = list[0 .. 1];
+        list.popFront;
+        T[] leftover;
+        foreach (item; list)
+            (sorted.back <= item ? sorted : leftover) ~= item;
+        result = merge(sorted, result);
+        list = leftover;
+    }
+
+    return result;
+}
+
+void main() {
+    auto arr = [-2,0,-2,5,5,3,-1,-3,5,5,0,2,-4,4,2];
+    arr.strandSort.writeln;
+}