day1_part2.jakt

/// Expect:
/// - output: "77666\n"

import reader

function main() {
    mut frequency: i32 = 0
    mut seen: [i32:bool] = [:]
    mut found = false

    while true {
        for change in reader::lines_string(day: 1).iterator() {
            mut number = change.substring(start: 1, length: change.length()-1).to_int()

            if number.has_value() {
                match change.substring(start: 0, length: 1) {
                    "+" => { 
                        frequency += number!
                    }
                    else => {
                        frequency -= number!
                    }
                }
            }

            if seen.contains(frequency) {
                found = true
                break
            }

            seen[frequency] = true
        }

        if found {
            break
        }
    }

    println("{}", frequency)
}