多线程 分配

    int thread_num= mThreadnum-1;
    int i;
    int count=pwdvect.size();
    int per = count / thread_num;
    int yu = count % thread_num;
    int x = 0, y = 0;
    for (i = 0; i != thread_num; i++)
    {
        if (i == 0)
        {
            x = 0;
            y = per - 1;
        }
        else
        {
            x = y + 1;
            y = x + per - 1;
        }
        mBegin[i] = x;
        mEnd[i] = y;
    }

    mBegin[i] = pwdvect.size() - yu;
    mEnd[i] = pwdvect.size()-1;