Given a non-negative number represented as an array of digits, plus one to the number.
The digits are stored such that the most significant digit is at the head of the list.
class Solution {
public:
vector<int> plusOne(vector<int>& digits) {
int len = digits.size();
reverse(digits.begin(), digits.end());
vector<int> result;
if(len == 0)
result.push_back(1);
int c = 0;
int s = 0;
int r = 0;
r = digits[0] + 1 + c;
s = r % 10;
c = r / 10;
result.push_back(s);
if(!c) //如果没有产生进位
for(int i=1; i<len; i++)
result.push_back(digits[i]);
else
{
for(int i=1; i<len; i++)
{
r = digits[i] + c;
s = r % 10;
c = r / 10;
result.push_back(s);
}
if(c) //最后的进位
result.push_back(1);
}
reverse(result.begin(), result.end());
return result;
}
};