From 4f7f33cc750cade06d370379c92bee8e72b5d742 Mon Sep 17 00:00:00 2001
From: Andrew Scott <git@andyscott.me>
Date: Wed, 11 Dec 2024 02:27:54 -0500
Subject: [PATCH] 2024: Day 3 completed

---
 2024/data/day3.txt |   6 +++
 2024/src/day3.zig  | 109 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 2024/data/day3.txt
 create mode 100644 2024/src/day3.zig

diff --git a/2024/data/day3.txt b/2024/data/day3.txt
new file mode 100644
index 0000000..c97cbdb
--- /dev/null
+++ b/2024/data/day3.txt
@@ -0,0 +1,6 @@
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diff --git a/2024/src/day3.zig b/2024/src/day3.zig
new file mode 100644
index 0000000..b2ac7ea
--- /dev/null
+++ b/2024/src/day3.zig
@@ -0,0 +1,109 @@
+const std = @import("std");
+
+const util = @import("util.zig");
+const allocator = util.alloc;
+const log = util.log;
+
+const Status = enum { multiply, disabled, scan };
+
+const MulOp = struct {
+    multiplicand: u32,
+    multiplier: u32,
+    status: Status,
+
+    fn init() MulOp {
+        return MulOp{
+            .multiplicand = 0,
+            .multiplier = 0,
+            .status = .scan,
+        };
+    }
+
+    fn reset(self: *MulOp) void {
+        self.multiplicand = 0;
+        self.multiplier = 0;
+        self.status = .scan;
+    }
+
+    fn multiply(self: MulOp) !u32 {
+        return std.math.mul(u32, self.multiplicand, self.multiplier);
+    }
+};
+
+// PART 1
+fn scanForUncorrupted(comptime T: type, window: *std.mem.WindowIterator(T), mul: *MulOp, part: u2) !u32 {
+    var sum: u32 = 0;
+    outer: while (window.next()) |win| {
+        if (part == 2) {
+            if (std.mem.startsWith(u8, win, "don't()")) {
+                mul.status = .disabled;
+                break;
+            }
+        }
+
+        if (!std.mem.startsWith(u8, win, "mul(")) {
+            continue;
+        }
+
+        for (win[4..]) |c| {
+            switch (c) {
+                '0'...'9' => {
+                    if (mul.status == .multiply) {
+                        mul.multiplier = mul.multiplier * 10 + try std.fmt.parseUnsigned(u32, &[_]u8{c}, 10);
+                    } else {
+                        mul.multiplicand = mul.multiplicand * 10 + try std.fmt.parseUnsigned(u32, &[_]u8{c}, 10);
+                    }
+                },
+                ',' => {
+                    if (mul.status == .multiply) {
+                        mul.reset();
+                        continue :outer;
+                    }
+                    mul.status = .multiply;
+                },
+                ')' => {
+                    sum += try mul.multiply();
+                    mul.reset();
+                    continue :outer;
+                },
+                else => {
+                    mul.reset();
+                    continue :outer;
+                },
+            }
+        }
+    }
+    return sum;
+}
+
+// PART 2
+pub fn maybeScan(comptime T: type, window: *std.mem.WindowIterator(T)) !u32 {
+    var sum: u32 = 0;
+    var mul = MulOp.init();
+    while (window.next()) |win| {
+        if (std.mem.startsWith(u8, win, "do()"))
+            mul.status = .scan;
+
+        if (std.mem.startsWith(u8, win, "don't()"))
+            mul.status = .disabled;
+
+        if (mul.status == .scan) {
+            sum += try scanForUncorrupted(u8, window, &mul, 2);
+        }
+    }
+    return sum;
+}
+
+pub fn main() !void {
+    const input = try util.readAllInput(3, allocator);
+
+    var mul = MulOp.init();
+    var window = std.mem.window(u8, input, 12, 1);
+    const p1 = try scanForUncorrupted(u8, &window, &mul, 1);
+
+    window.reset();
+    const p2 = try maybeScan(u8, &window);
+
+    log.info("PART 1: {d}\n", .{p1});
+    log.info("PART 2: {d}\n", .{p2});
+}