From 78fa87cd43cd18f2f9ec4a04c45bcb8036143fd8 Mon Sep 17 00:00:00 2001
From: Christian Segundo
Date: Sat, 3 Dec 2022 11:51:40 +0100
Subject: add day 3

---
 day-3/main_1.zig | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 day-3/main_1.zig

(limited to 'day-3/main_1.zig')

diff --git a/day-3/main_1.zig b/day-3/main_1.zig
new file mode 100644
index 0000000..d65161b
--- /dev/null
+++ b/day-3/main_1.zig
@@ -0,0 +1,39 @@
+const std = @import("std");
+const slurp = @import("util/file.zig").slurp;
+const dupl_values = @import("util/mem.zig").dupl_values;
+
+var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+const allocator = gpa.allocator();
+
+pub fn main() !void {
+    const file_buffer = try slurp(allocator, "./input");
+    defer allocator.free(file_buffer);
+
+    var iter = std.mem.split(u8, file_buffer, "\n");
+
+    var count: u16 = 0;
+    while (iter.next()) |line| {
+        const duplicates = try dupl_values(
+            u8,
+            allocator,
+            &[_][]const u8{
+                line,
+                iter.next().?,
+                iter.next().?,
+            },
+        );
+        defer allocator.free(duplicates);
+
+        for (duplicates) |char| {
+            count += char_to_priority(char);
+        }
+    }
+
+    std.debug.print("{d}\n", .{count});
+}
+
+fn char_to_priority(char: u8) u8 {
+    if (char >= 65 and char <= 90)
+        return char - 38;
+    return char - 96;
+}
-- 
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