Plus One

问题：数组模拟整数加1

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class Solution { public:     vector<int> plusOne(vector<int> &digits) {         int i,k=0;         int a[100];         for(i=digits.size()-1;i>=0;i--)            a[k++]=digits[i];         int c=1;         for(i=0;i<k;i++)         {             int sum=a[i]+c;             a[i]=sum%10;             c=sum/10;         }         if(c!=0) a[k++]=c;         vector<int> vec;         for(i=k-1;i>=0;i--) vec.push_back(a[i]);         return vec;     } };