3751. Total Waviness of Numbers in Range I

class Solution {
    public int totalWaviness(int num1, int num2) {

        int ans = 0;

        for (int num = num1; num <= num2; num++) {
            ans += getWaviness(num);
        }

        return ans;
    }

    private int getWaviness(int num) {

        char[] digits = String.valueOf(num).toCharArray();

        if (digits.length < 3) {
            return 0;
        }

        int waviness = 0;

        for (int i = 1; i < digits.length - 1; i++) {

            if ((digits[i] > digits[i - 1] && digits[i] > digits[i + 1]) ||
                (digits[i] < digits[i - 1] && digits[i] < digits[i + 1])) {
                waviness++;
            }
        }

        return waviness;
    }
}

class Solution:
    def totalWaviness(self, num1: int, num2: int) -> int:

        def get_waviness(num):
            digits = str(num)

            if len(digits) < 3:
                return 0

            waviness = 0

            for i in range(1, len(digits) - 1):
                if ((digits[i] > digits[i - 1] and digits[i] > digits[i + 1]) or
                    (digits[i] < digits[i - 1] and digits[i] < digits[i + 1])):
                    waviness += 1

            return waviness

        ans = 0

        for num in range(num1, num2 + 1):
            ans += get_waviness(num)

        return ans

class Solution {
public:
    int totalWaviness(int num1, int num2) {

        int ans = 0;

        for (int num = num1; num <= num2; num++) {
            ans += getWaviness(num);
        }

        return ans;
    }

private:
    int getWaviness(int num) {

        string digits = to_string(num);

        if (digits.length() < 3)
            return 0;

        int waviness = 0;

        for (int i = 1; i < digits.length() - 1; i++) {

            if ((digits[i] > digits[i - 1] && digits[i] > digits[i + 1]) ||
                (digits[i] < digits[i - 1] && digits[i] < digits[i + 1])) {
                waviness++;
            }
        }

        return waviness;
    }
};

var totalWaviness = function(num1, num2) {

    function getWaviness(num) {

        const digits = String(num);

        if (digits.length < 3) {
            return 0;
        }

        let waviness = 0;

        for (let i = 1; i < digits.length - 1; i++) {

            if ((digits[i] > digits[i - 1] && digits[i] > digits[i + 1]) ||
                (digits[i] < digits[i - 1] && digits[i] < digits[i + 1])) {
                waviness++;
            }
        }

        return waviness;
    }

    let ans = 0;

    for (let num = num1; num <= num2; num++) {
        ans += getWaviness(num);
    }

    return ans;
};