Data commit

Task/Bulls-and-cows/D/bulls-and-cows.d

@@ -0,0 +1,18 @@
+void main() {
+    import std.stdio, std.random, std.string, std.algorithm,
+           std.range, std.ascii;
+
+    immutable hidden = "123456789"d.randomCover.take(4).array;
+    while (true) {
+        "Next guess: ".write;
+        const d = readln.strip.array.sort().release;
+        if (d.count == 4 && d.all!isDigit && d.uniq.count == 4) {
+            immutable bulls = d.zip(hidden).count!q{ a[0] == a[1] },
+                      cows = d.count!(g => hidden.canFind(g)) - bulls;
+            if (bulls == 4)
+                return " You guessed it!".writeln;
+            writefln("bulls %d, cows %d", bulls, cows);
+        }
+        " Bad guess! (4 unique digits, 1-9)".writeln;
+    }
+}