卖萌的弱渣

I am stupid, I am hungry.

Plus One

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.

Solution

  • Java solution:
(Plus-One.java) download
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public class Solution {
    public int[] plusOne(int[] digits) {
            int n=digits.length;

            for (int i=n-1;i>=0;i--){

                if (digits[i]<9){
                    digits[i]++;
                    return digits;
                }
                digits[i] = 0;
            }
            int[] newdigits = new int[n+1];
            newdigits[0] =1;
            return newdigits;
        }
}
  • Python
(Plus-One.py) download
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class Solution(object):
    def plusOne(self, digits):
        """
        :type digits: List[int]
        :rtype: List[int]
        """
        n = len(digits)-1
        addon = 1
        for i in range(n,-1,-1):
            newval = digits[i]+addon
            digits[i] = newval%10
            if newval < 10:
                return digits
            addon = newval / 10
        if addon == 1:
            digits.insert(0,1)
        return digits