数组 a 和 b 按低位在前的顺序保存两个非负大整数。下面代码实现高精度加法，横线处应填写（ ）。
vector<int> add(const vector<int> &a, const vector<int> &b) {
vector<int> c;
int carry = 0;
int n = max(a.size(), b.size());
for (int i = 0; i < n; i++) {
int sum = carry;
if (i < a.size())
sum += a[i];
if (i < b.size())
sum += b[i];
c.push_back(sum % 10);
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}
if (carry)
c.push_back(carry);
return c;
}
- A.
carry = sum % 10; - B.
carry = sum; - C.
carry = sum / 10; - D.
carry = c[i] / 10;