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Largest Number At Least Twice of Others

EasyArraySorting
Solve on LeetCode

Easy · linear scan solution for Largest Number At Least Twice of Others. Python, Go, and a step-by-step animation.

01

Problem

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

LeetCode 747. Largest Number At Least Twice of Others. 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

Largest Number At Least Twice of Others — linear scan

Keep a running answer while you walk the array once. Built for LeetCode 747. Largest Number At Least Twice of Others.

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 largestNumberAtLeastTwiceOfOthers(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 “Largest Number At Least Twice of Others — linear scan”. Edit the input, hit Run, then scrub.

Approach: Largest Number At Least Twice of Others — linear scan

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