Day 2

day2/puzzle1.zig

@@ -25,11 +25,11 @@ pub fn main() !void {
         //scissors - rock = 2 WIN
         //scissors - paper = 1 LOSE
 
-        switch (op - me) {
+        total_points += switch (op - me) {
-            -1, 2 => total_points += 6,
+            -1, 2 => 6,
-            -2, 1 => total_points += 0,
+            -2, 1 => 0,
-            else => total_points += 3,
+            else => 3,
-        }
+        };
 
         total_points += @intCast(u4, me);
     }

day2/puzzle2.zig

@@ -0,0 +1,30 @@
+const std = @import("std");
+
+const mem = std.mem;
+const fmt = std.fmt;
+
+const print = std.debug.print;
+
+const input = @embedFile("input");
+
+pub fn main() !void {
+    var total_points: u32 = 0;
+    // Split the input
+    var input_iter = mem.split(u8, input, "\n");
+    while (input_iter.next()) |line| {
+        // Input ends with an empty line
+        if (line.len == 0) continue;
+        // Converting character code to points
+        const op = line[0] -| 'A';
+        const me = line[2] -| 'X';
+
+        // A   3   1   2
+        // B   1   2   3
+        // C   2   3   1
+        //     X   Y   Z
+
+        // This works, OK? Trust me bro
+        total_points += ((me + op + 2) % 3) + 1 + (me * 3);
+    }
+    print("{}\n", .{total_points});
+}