Part01

src/day01.zig

@@ -9,8 +9,61 @@ const util = @import("util.zig");
 const gpa = util.gpa;
 
 const data = @embedFile("data/day01.txt");
+const data2 = @embedFile("data/day01_part2.txt");
 
-pub fn main() !void {}
+pub fn main() !void {
+    const allocator = std.heap.page_allocator;
+
+    try part01(allocator, data);
+}
+
+fn find_first_digit_number(word: []const u8) !u8 {
+    var i: usize = 0;
+
+    while (i < word.len) : (i += 1) {
+        if (std.ascii.isDigit(word[i])) {
+            return word[i];
+        }
+    }
+
+    return word[i];
+}
+
+fn find_last_digit_number(word: []const u8) !u8 {
+    var i: usize = word.len - 1;
+
+    while (i < word.len) : (i -= 1) {
+        if (std.ascii.isDigit(word[i])) {
+            std.debug.print("last {}\n", .{word[i]});
+            return word[i];
+        }
+    }
+
+    return word[i];
+}
+
+fn part01(allocator: std.mem.Allocator, day01: []const u8) !void {
+    var splits = std.mem.split(u8, day01, "\n");
+    var total: u32 = 0;
+    while (splits.next()) |line| {
+        if (line.len <= 0) {
+            continue;
+        }
+
+        std.debug.print("Line: {s}\n", .{line});
+        const first_digit_char = try find_first_digit_number(line);
+        const last_digit_char = try find_last_digit_number(line);
+
+        const first_and_last = try std.fmt.allocPrint(allocator, "{c}{c}", .{ first_digit_char, last_digit_char });
+
+        std.debug.print("{c} + {c}\n", .{ first_digit_char, last_digit_char });
+        var digits: u32 = 0;
+        digits = try std.fmt.parseInt(u32, first_and_last, 10);
+        total += digits;
+    }
+
+    std.debug.print("First Total: {d}\n", .{total});
+}
 
 // Useful stdlib functions
 const tokenizeAny = std.mem.tokenizeAny;