Day 3 in zig; skipped day 2 in zig for now

rust/2/sampleinput.txt

@@ -1,6 +1,4 @@
-A X draw = 1 + 3 = 4. Also my parsing just takes the 1st and 3rd characters of
-the lines so I can type anything else after that and it'll work as an input
-file kek
+A X draw = 1 + 3 = 4
 A Y win  = 2 + 6 = 8
 A Z loss = 3 + 0 = 3 <- not 9
 B X loss = 1 + 0 = 1

zig/2/part1.zig

@@ -0,0 +1,19 @@
+const std = @import("std");
+
+// define wins lookup table
+
+pub fn main() !void {
+    var file = try std.fs.cwd().openFile("input.txt", .{});
+    defer file.close();
+
+    var a = std.io.bufferedReader(file.reader());
+    var readerStream = a.reader();
+
+    var buf: [32]u8 = undefined;
+    var score: i32 = 0;
+    while (try readerStream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+        // get score
+    }
+
+    std.debug.print("{d}\n", .{score});
+}

zig/3/input.txt

@@ -0,0 +1,300 @@
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zig/3/part1.zig

@@ -0,0 +1,57 @@
+const std = @import("std");
+
+const lcConversion = 'a';
+const ucConversion = 'A' - 26;
+
+const charIndexer = struct {
+    pub const Key = u8;
+    pub const count: usize = 52;
+    pub fn indexOf(e: u8) usize {
+        return letterToIdx(e);
+    }
+    pub fn keyForIndex(i: usize) u8 {
+        return idxToLetter(i);
+    }
+};
+const CharSet: type = std.enums.IndexedSet(charIndexer, std.enums.NoExtension);
+
+fn letterToIdx(char: u8) u8 {
+    return switch (char) {
+        'a'...'z' => char - lcConversion,
+        'A'...'Z' => char - ucConversion,
+        else => unreachable,
+    };
+}
+
+fn idxToLetter(i: usize) u8 {
+    const char = @intCast(u8, i);
+    return if (char < 26) char + lcConversion else char + ucConversion;
+}
+
+pub fn main() !void {
+    var file = try std.fs.cwd().openFile("input.txt", .{});
+    defer file.close();
+
+    var a = std.io.bufferedReader(file.reader());
+    var readerStream = a.reader();
+
+    var buf: [200]u8 = undefined;
+    var score: i32 = 0;
+    while (try readerStream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+        var bagOne: CharSet = .{};
+        var bagTwo: CharSet = .{};
+        var i: u32 = 0;
+        while (i < line.len / 2) : (i += 1) {
+            bagOne.setPresent(line[i], true);
+        }
+        while (i < line.len) : (i += 1) {
+            bagTwo.setPresent(line[i], true);
+        }
+        bagOne.setIntersection(bagTwo);
+        if (bagOne.count() != 1) unreachable; // ensure only one element in common
+        var iter = bagOne.iterator();
+        score += letterToIdx(iter.next().?) + 1;
+    }
+
+    std.debug.print("{d}\n", .{score});
+}

zig/3/part2.zig

@@ -0,0 +1,58 @@
+const std = @import("std");
+
+const lcConversion = 'a';
+const ucConversion = 'A' - 26;
+
+const charIndexer = struct {
+    pub const Key = u8;
+    pub const count: usize = 52;
+    pub fn indexOf(e: u8) usize {
+        return letterToIdx(e);
+    }
+    pub fn keyForIndex(i: usize) u8 {
+        return idxToLetter(i);
+    }
+};
+const CharSet: type = std.enums.IndexedSet(charIndexer, std.enums.NoExtension);
+
+fn letterToIdx(char: u8) u8 {
+    return switch (char) {
+        'a'...'z' => char - lcConversion,
+        'A'...'Z' => char - ucConversion,
+        else => unreachable,
+    };
+}
+
+fn idxToLetter(i: usize) u8 {
+    const char = @intCast(u8, i);
+    return if (char < 26) char + lcConversion else char + ucConversion;
+}
+
+pub fn main() !void {
+    var file = try std.fs.cwd().openFile("input.txt", .{});
+    defer file.close();
+
+    var a = std.io.bufferedReader(file.reader());
+    var readerStream = a.reader();
+
+    var buf: [200]u8 = undefined;
+    var score: i32 = 0;
+    read: while (true) {
+        var bags = [_]CharSet{ .{}, .{}, .{} };
+        for (bags) |*bag| {
+            const maybeLine = try readerStream.readUntilDelimiterOrEof(&buf, '\n');
+            if (maybeLine) |line| {
+                for (line) |char| {
+                    bag.setPresent(char, true);
+                }
+            } else break :read;
+        }
+        bags[0].setIntersection(bags[1]);
+        bags[0].setIntersection(bags[2]);
+        if (bags[0].count() != 1) unreachable; // ensure only one element in common
+        var iter = bags[0].iterator();
+        score += letterToIdx(iter.next().?) + 1;
+    }
+
+    std.debug.print("{d}\n", .{score});
+}