Leetcode-989 Add to Array-Form of Integer(数组形式的整数加法)

大数加法，没什么好说的，乱搞过了

#define maxn 1000000
#define _for(i,a,b) for(int i = (a);i < (b);i ++)
#define pb push_back

class Solution
{
    public:
        vector<int> addToArrayForm(vector<int>& A, int K)
        {
            vector<int> B;
            while(K)
            {
                B.pb(K%10);
                K/=10;
            } 
            reverse(A.begin(),A.end());
            vector<int> rnt(max(A.size(),B.size())+1);
            for(int i = 0;i < max(A.size(),B.size());i ++)
            {
                if(i<min(A.size(),B.size()))
                    rnt[i] = A[i]+B[i];
                else if(A.size()>B.size())
                    rnt[i] = 0 +A[i];
                else
                   rnt[i] = 0+B[i];
            }
            for(int i = 0 ;i < rnt.size();i ++)
            {
                if(rnt[i]>=10)
                {
                    rnt[i] -= 10;
                    rnt[i+1] ++;
                }
            }
            if(rnt[rnt.size()-1]==0)
                rnt.pop_back();
            reverse(rnt.begin(),rnt.end());
            return rnt;
        }
};