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Total Waviness of Numbers in Range I

MediumMathDP
Solve on LeetCode

Medium · linear scan solution for Total Waviness of Numbers in Range I. Python, Go, and a step-by-step animation.

01

Problem

Read the prompt, flip through the examples, then steal the idea.

LeetCode 3751. Total Waviness of Numbers in Range I. The copyrighted prompt is on LeetCode. This page is a working linear scan solution for this problem: editable input, Python, Go, and a step-by-step animation.

Constraints

  • —Player inputs are capped so the animation stays readable.
  • —Match LeetCode's own constraints when you submit there.

Examples

Input

nums =
[2, 1, 5, 3]

Output

5

A single pass keeps the running maximum. 5 wins.

02

Solution

Python and Go. The walkthrough below runs this same code.

Approach 1Optimal▶ Animated

Total Waviness of Numbers in Range I — linear scan

Keep a running answer while you walk the array once. Built for LeetCode 3751. Total Waviness of Numbers in Range I.

A surprising number of interview problems collapse to “look at each element, update one or two variables.” Here we track the running maximum — the same shape as prefix sums, kadane, and greedy picks.

Algorithm

  1. Seed best with the first element.
  2. For each later x, set best = max(best, x).
  3. Return best.
Time
O(n)
Space
O(1)
Solution.py
class Solution:    def totalWavinessOfNumbersInRangeI(self, nums: list[int]) -> int:        best = nums[0]        for x in nums[1:]:            if x > best:                best = x        return best
Watch this run

03

Interactive walkthrough

Playing “Total Waviness of Numbers in Range I — linear scan”. Edit the input, hit Run, then scrub.

Approach: Total Waviness of Numbers in Range I — linear scan

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