Leetcode 3751. Total Waviness of Numbers in Range I #leetcode #dailychallenge #day5 #python

3751. Total Waviness of Numbers in Range I
You are given two integers num1 and num2 representing an inclusive range [num1, num2].

The waviness of a number is defined as the total count of its peaks and valleys:

A digit is a peak if it is strictly greater than both of its immediate neighbors.
A digit is a valley if it is strictly less than both of its immediate neighbors.
The first and last digits of a number cannot be peaks or valleys.
Any number with fewer than 3 digits has a waviness of 0.
Return the total sum of waviness for all numbers in the range [num1, num2].


Example 1:

Input: num1 = 120, num2 = 130

Output: 3

Explanation:

In the range [120, 130]:
120: middle digit 2 is a peak, waviness = 1.
121: middle digit 2 is a peak, waviness = 1.
130: middle digit 3 is a peak, waviness = 1.
All other numbers in the range have a waviness of 0.
Thus, total waviness is 1 + 1 + 1 = 3.

Example 2:

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