G2: 大数加法

第一个数字是在数组里，第二个是个32bit uint

uncompleted, not mine code.

void add(vector<int> & a, uint b)
{       
        int remainder = 0;
        int i;
        for(i = a.size() - 1; i > -1 && b > 0; --i)
        {
                a[i] += remainder + b % 10;
                b = b / 10;
                if(a[i] >= 10)
                {
                        a[i] -= 10;
                        remainder = 1;
                } 
                else
                { 
                        remainder = 0;
                }               
        }
        if(i == -1)
        {
                while(b > 0)
                {
                        uint x = b % 10 + remainder;
                        b = b / 10;
                        if(x >= 10)
                        {
                             x -= 10;
                             remainder = 1;
                        }
                        else
                        {
                                remainder = 0;
                        }
                        a.insert(a.begin(), x);
               }
        }
        else if(remainder == 1)
        {
                for(int j = i; j > - 1; --j)
                {
                        a[j] += remainder ;
                        if(a[j] >= 10)
                        {
                                a[j] -= 10;
                                remainder = 1;
                        }
                        else
                        {
                                break;
                        }
                }
        }
        if(remainder == 1)
        {
                a.insert(a.begin(), 1);
        }
}