Basic stuff

src/day01.zig

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+const std = @import("std");
+const testing = std.testing;
+const expect = testing.expect;
+const ArrayList = std.ArrayList;
+
+pub fn main() !void {
+    //const allocator = std.heap.page_allocator;
+    std.debug.print("Hello, {s}!\n", .{"World"});
+}
+
+fn parse_line(line: []const u8) !struct { u32, u32 } {
+    var parts = std.mem.tokenizeScalar(u8, line, ' ');
+    const left = try std.fmt.parseInt(u32, parts.next().?, 10);
+    const right = try std.fmt.parseInt(u32, parts.next().?, 10);
+    return .{ left, right };
+}
+
+fn get_list(str_input: []const u8, allocator: std.mem.Allocator) !struct { ArrayList(u32), ArrayList(u32) } {
+    var left = ArrayList(u32).init(allocator);
+    var right = ArrayList(u32).init(allocator);
+
+    var lines = std.mem.splitSequence(u8, str_input, "\n");
+    while (lines.next()) |line| {
+        const a, const b = try parse_line(line);
+        try left.append(a);
+        try right.append(b);
+    }
+
+    return .{ left, right };
+}
+
+const test_allocator = std.testing.allocator;
+const input = "3   4\n4   3\n2   5\n1   3\n3   9\n3   3";
+
+test "day01_given_example" {
+    const left, const right = try get_list(input, test_allocator);
+    defer {
+        left.deinit();
+        right.deinit();
+    }
+    // const expected_distances = [_]u32{ 2, 1, 0, 1, 2, 5 };
+    // const expected_distance_total: u32 = 11;
+    try expect(false);
+}
+
+test "day01_parse_line" {
+    const left, const right = try parse_line("3   4");
+    try expect(left == 3);
+    try expect(right == 4);
+}
+
+test "day01_parse_list" {
+    const left, const right = try get_list(input, test_allocator);
+    defer {
+        left.deinit();
+        right.deinit();
+    }
+
+    try expect(std.mem.eql(u32, left.items, &[_]u32{ 3, 4, 2, 1, 3, 3 }));
+    try expect(std.mem.eql(u32, right.items, &[_]u32{ 4, 3, 5, 3, 9, 3 }));
+}