function calc_dna(genes: string[], genes_hp: number[], dnas: [number, number, string][]): [number, number] {
    // will return all indexs of [key] inside [str] fast
    const find_all_indexOf = (str: string, key: string): number[] => {
        let indexs: number[] = []
        let index = str.indexOf(key)

        while (index != -1) {
            indexs.push(index);
            index = str.indexOf(key, index + 1);
        }

        return indexs
    }

    let result: [number, number] = [Number.MAX_SAFE_INTEGER, Number.MIN_SAFE_INTEGER]

    // for each [dna] ...
    dnas.forEach(([f, t, dna]) => {
        let memo = new Map<string, number>()
        let hp_total = 0

        // for each [gene] from [f] to [t] ...
        for (let i = f; i <= t; i += 1000) {
            let memokey = `${dna}:${genes[i]}`
            if (!memo.has(memokey)) memo.set(memokey, find_all_indexOf(dna, genes[i]).length)
            // sum with multiply number of times [gene] appear in [dna] * it [hp]
            hp_total += memo.get(memokey) * genes_hp[i]
        }

        // bind smallest and biggest
        if (hp_total < result[0]) result[0] = hp_total
        if (hp_total > result[1]) result[1] = hp_total
    })

    return result
}