Initial data commit

Task/Permutations/D/permutations-1.d

@@ -0,0 +1,21 @@
+T[][] permutations(T)(T[] items) pure nothrow {
+    T[][] result;
+
+    void perms(T[] s, T[] prefix=[]) nothrow {
+        if (s.length)
+            foreach (immutable i, immutable c; s)
+               perms(s[0 .. i] ~ s[i+1 .. $], prefix ~ c);
+        else
+            result ~= prefix;
+    }
+
+    perms(items);
+    return result;
+}
+
+version (permutations1_main) {
+    void main() {
+        import std.stdio;
+        writefln("%(%s\n%)", [1, 2, 3].permutations);
+    }
+}