Day 1

The input

There are some numbers in each line, hidden between characters.

data_in="../../DATA/2023/input_day01.txt"
head $data_in
wc -l $data_in

PART 1

The puzzle

I need to find the numbers in each line and re-create them. Next, I need to add up all the numbers in the document.

input_file = open("../../DATA/2023/input_day01.txt", "r");
line = readline(input_file);

all_numbers = Int32[];
while line != ""
    split_line = split(line, "");
    current_numbers = [];
    for sign ∈ split_line
        try
            push!(current_numbers, parse(Int, sign));
        catch err
        end
    end
    out_number = parse(
        Int,
        string(first(current_numbers), last(current_numbers))
    )
    push!(all_numbers, out_number);

    # read the next line:
    global line = readline(input_file);
end

close(input_file);

The solution

Now, I have all the numbers:

all_numbers

1000-element Vector{Int32}:
 22
 99
 16
 77
 66
 54
 22
 72
 66
 15
 25
 41
 73
  ⋮
 76
 14
 79
 15
 16
 33
 34
 72
 11
 37
 72
 26

The sum of these numbers is 54388.

PART 2

The task is more difficult than I thought! :D

The numbers can also be spelled: one, two, three, four, five, six, seven, eight, or nine.

input_file = open("../../DATA/2023/input_day01.txt", "r");
line = readline(input_file);

all_numbers = Int32[];
all_spelled_numbers = Dict(
    "one" => 1, "two" => 2, "three" => 3, "four" => 4, "five" => 5,
    "six" => 6, "seven" => 7, "eight" => 8, "nine" => 9
);
while line != ""
    current_numbers = DataFrame(
        index = -1;
        number = -1
    );
    # first - check spelled numbers
    for spelled_num ∈ keys(all_spelled_numbers)
        if occursin(spelled_num, line)
            first_idx = first(findfirst(spelled_num, line));
            last_idx = first(findlast(spelled_num, line));
            cur_number = all_spelled_numbers[spelled_num];
            if first_idx != last_idx
                append!(current_numbers, DataFrame(
                    index = [first_idx, last_idx],
                    number = [cur_number, cur_number]
                ));
            else
                append!(current_numbers, DataFrame(
                    index = first_idx,
                    number = cur_number
                ));
            end
        end
    end
    # then - check digits
    for digit_num ∈ values(all_spelled_numbers)
        if occursin(string(digit_num), line)
            first_idx = first(findfirst(string(digit_num), line));
            last_idx = first(findlast(string(digit_num), line));
            if first_idx != last_idx
                append!(current_numbers, DataFrame(
                    index = [first_idx, last_idx],
                    number = [digit_num, digit_num]
                ));
            else
                append!(current_numbers, DataFrame(
                    index = first_idx,
                    number = digit_num
                ));
            end
        end
    end

    # first row was used only to set the types of columns correctly
    deleteat!(current_numbers, 1)
    sort!(current_numbers, order(:index))
    out_number = parse(Int, string(first(current_numbers.number), last(current_numbers.number)))
    push!(all_numbers, out_number);

    # read the next line:
    global line = readline(input_file);
end

close(input_file);

The solution

Now, I have all the numbers:

all_numbers

1000-element Vector{Int32}:
 32
 19
 16
 16
 16
 55
 72
 52
 86
 25
 18
 46
 53
  ⋮
 75
 94
 19
 14
 16
 33
 34
 77
 91
 87
 58
 26

The sum of these numbers is 53515.