package q443

func compress(chars []byte) int {
	seqLen := 0
	char := chars[0]

	p := 1

	writeNumber := func(num int) {
		i := 1
		for ; i*10 <= num; i *= 10 {
		}
		for ; i > 0; i /= 10 {
			chars[p] = byte(num/i) + '0'
			p++
			num %= i
		}
	}

	for _, c := range chars {
		if c == char {
			seqLen++
		} else {
			char = c
			if seqLen > 1 {
				writeNumber(seqLen)
			}
			seqLen = 1
			chars[p] = char
			p++
		}
	}
	if seqLen > 1 {
		writeNumber(seqLen)
	}
	return p
}

var _ = compress