Plus One

class Solution:
    def plusOne(self, digits: List[int]) -> List[int]:
        for i in range(len(digits)-1, -1, -1):
            if digits[i] < 9:
                digits[i] += 1
                return digits
            digits[i] = 0
        return [1] + digits

class Solution {
public:
    vector<int> plusOne(vector<int>& digits) {
        for (int i = digits.size()-1; i >= 0; i--) {
            if (digits[i] < 9) { digits[i]++; return digits; }
            digits[i] = 0;
        }
        digits.insert(digits.begin(), 1);
        return digits;
    }
};

function plusOne(digits: number[]): number[] {
    for (let i = digits.length - 1; i >= 0; i--) {
        if (digits[i] < 9) { digits[i]++; return digits; }
        digits[i] = 0;
    }
    return [1, ...digits];
}