Data commit

Task/Department-numbers/Zig/department-numbers-1.zig

@@ -0,0 +1 @@
+const std = @import("std");

Task/Department-numbers/Zig/department-numbers-2.zig

@@ -0,0 +1,14 @@
+pub fn main() !void {
+    const stdout = std.io.getStdOut().writer();
+
+    _ = try stdout.writeAll("Police  Sanitation  Fire\n");
+    _ = try stdout.writeAll("------  ----------  ----\n");
+
+    var p: usize = 2;
+    while (p <= 7) : (p += 2)
+        for (1..7 + 1) |s|
+            for (1..7 + 1) |f|
+                if (p != s and s != f and f != p and p + f + s == 12) {
+                    _ = try stdout.print("  {d}         {d}         {d}\n", .{ p, s, f });
+                };
+}

Task/Department-numbers/Zig/department-numbers-3.zig

@@ -0,0 +1 @@
+const std = @import("std");

Task/Department-numbers/Zig/department-numbers-4.zig

@@ -0,0 +1,14 @@
+pub fn main() !void {
+    const stdout = std.io.getStdOut().writer();
+
+    _ = try stdout.writeAll("Police  Sanitation  Fire\n");
+    _ = try stdout.writeAll("------  ----------  ----\n");
+
+    var it = SolutionIterator{};
+    while (it.next()) |solution| {
+        _ = try stdout.print(
+            "  {d}         {d}         {d}\n",
+            .{ solution.police, solution.sanitation, solution.fire },
+        );
+    }
+}

Task/Department-numbers/Zig/department-numbers-5.zig

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+const SolutionIterator = struct {
+    // 5 bit unsigned (u5) allows addition up to 31
+    p: u5 = 2,
+    s: u5 = 1,
+    f: u5 = 0,
+
+    /// 3 bit unsigned (u3) limits 0 <= department <= 7
+    fn next(self: *SolutionIterator) ?struct { police: u3, sanitation: u3, fire: u3 } {
+        if (self.p > 7) return null; // already completed
+
+        while (true) {
+            self.f += 1; // fire
+            if (self.f > 7) {
+                self.f = 1;
+                self.s += 1; // sanitation
+                if (self.s > 7) {
+                    self.s = 1;
+                    self.p += 2; // police
+                    if (self.p > 7) {
+                        return null; // completed
+                    }
+                }
+            }
+            if (self.p + self.f + self.s == 12)
+                return .{
+                    .police = @truncate(self.p),
+                    .sanitation = @truncate(self.s),
+                    .fire = @truncate(self.f),
+                };
+        }
+    }
+};