// MARK: - 443. String Compression
// Сжать строку

func compress(_ chars: inout [Character]) -> Int {
    // i - чтобы итерироваться по масиву
    var i = 0
    var r = 0
    while i < chars.count {
        var currentChar = chars[i]
        var currentOccur = 0
        while i < chars.count && chars[i] == currentChar {
            currentOccur += 1
            i += 1
        }

        chars[r] = currentChar
        r += 1

        if currentOccur > 1 {
            let currOccurStr = String(currentOccur)
            for num in currOccurStr {
                chars[r] = num
                r += 1
            }
        }
    }
    return r
}

var a: [Character] = ["a","a","b","b","c","c","c","c"]
compress(&a)
print(a)