all tasks

Task/Zig-zag-matrix/D/zig-zag-matrix.d

@@ -0,0 +1,22 @@
+int[][] zigZag(in int n) pure nothrow {
+    static void move(in int n, ref int i, ref int j) pure nothrow {
+        if (j < n - 1) {
+            if (i > 0) i--;
+            j++;
+        } else
+            i++;
+    }
+
+    auto a = new int[][](n, n);
+    int x, y;
+    foreach (v; 0 .. n ^^ 2) {
+        a[y][x] = v;
+        (x + y) % 2 ? move(n, x, y) : move(n, y, x);
+    }
+    return a;
+}
+
+void main() {
+    import std.stdio;
+    writefln("%(%(%2d %)\n%)", zigZag(5));
+}