day01part2 ok

src/day01.zig

@@ -31,9 +31,27 @@ fn solve(str_input: []const u8, allocator: std.mem.Allocator) !u128 {
         total += (@max(right_item, left_item) - @min(right_item, left_item));
     }
 
+    const res2 = solve_part2(left, right);
+    std.debug.print("Result part 2: {d}\n", .{res2});
+
     return total;
 }
 
+fn solve_part2(first: ArrayList(u32), second: ArrayList(u32)) u128 {
+    var result: u128 = 0;
+    for (first.items) |n| {
+        var count: u128 = 0;
+        for (second.items) |r| {
+            if (n == r) {
+                count += 1;
+            }
+        }
+        result += n * count;
+    }
+
+    return result;
+}
+
 fn parse_line(line: []const u8) !struct { u32, u32 } {
     var parts = std.mem.tokenizeScalar(u8, line, ' ');
     if (parts.next()) |part| {
@@ -86,3 +104,5 @@ test "day01_parse_list" {
     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 }));
 }
+
+test "day01_part2" {}