LeetCode --- Plus One

题目链接

题意：给出一个以数组形式表示的数， 求该数加1后的结果，同样以数组形式返回。

附上代码：

 1 class Solution {  2 public:  3     vector<int> plusOne(vector<int> &digits) {  4         unsigned int len = digits.size();  5         for (unsigned int i = 0; i < len/2; i++) {  6             swap(digits[i], digits[len-1-i]);  7  }  8         int c = 1;  9         for (int i = 0; i < len and c; i++) { 10             int a = digits[i] + c; 11             c = a / 10; 12             digits[i] = a % 10; 13  } 14         if (c) { 15             digits.push_back(1); 16             len++; 17  } 18         for (unsigned int i = 0; i < len/2; i++) { 19             swap(digits[i], digits[len-1-i]); 20  } 21         

22         return digits; 23  } 24 };