66. Plus One Java solutions

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.

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题目大意就是用一个int数组来模拟十进制数加１的计算，需要注意的地方就是溢出的情况．

public class Solution {
    public int[] plusOne(int[] digits) {
        int len = digits.length;
        digits[len-1]++;
        boolean flag = false;//是否溢出
        for(int i=len -1; i>=0;i--){
            if(digits[i] >= 10) {
                if(i != 0){
                    digits[i-1]++;
                 }else{
                     flag =true;
                 }
                digits[i] -= 10;
            }
        }
        if(flag == true){
            int[] res = new int[len+1];
            res[0] = 1;
            for(int i = 0;i<len;i++){
                res[i+1] = digits[i];
            }
            return res;
        }else{
            return digits;
        }
        
    }
}