int compress(vector<char>& chars) {

    const int N = ;

    char words[N];//存储字符

    int count[N];//存储数字

    memset(words, ' ', sizeof(words));//count初始化为全' '

    memset(count, , sizeof(count));//count初始化为全0

    char lastChar = ' ';//ASCII:32

    int i = ;

    for (auto c : chars)

    {

        if (c != lastChar)//新字符

        {

            if (lastChar == ' ')

            {

                i = ;

            }

            else

            {

                i++;

            }

        }

        words[i] = c;

        count[i]++;

        lastChar = c;

    }

    chars.clear();

    for (int j = ; j <= i; j++)

    {

        chars.push_back(words[j]);

        int a = count[j];

        if (a == )

        {

            continue;

        }

        char str[];

        sprintf(str, "%d", a);

        for (auto s : str)

        {

            if (s == '\0')

            {

                break;

            }

            chars.push_back(s);

        }

    }

    int sum = chars.size();

    return sum;

}