How to Solve Last Moment Before All Ants Fall Out of a Plank Problem
Master the Last Moment Before All Ants Fall Out of a Plank LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
Interview Coder generates complete solutions and debugging hints that you can use while explaining your approach, so you stay calm and in control.
Last Moment Before All Ants Fall Out of a Plank
We have a wooden plank of the length n units. Some ants are walking on the plank, each ant moves with a speed of 1 unit per second. Some of the ants move to the left, the other move to the right. When...
Interview Coder will help you solve this problem in real-time during your interview
✨ Get instant solutions, explanations, and code generation
Understanding the Last Moment Before All Ants Fall Out of a Plank Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
We have a wooden plank of the length n units. Some ants are walking on the plank, each ant moves with a speed of 1 unit per second. Some of the ants move to the left, the other move to the right. When two ants moving in two different directions meet at some point, they change their directions and continue moving again. Assume changing directions does not take any additional time. When an ant reaches one end of the plank at a time t, it falls out of the plank immediately. Given an integer n and two integer arrays left and right, the positions of the ants moving to the left and the right, return the moment when the last ant(s) fall out of the plank.
Last Moment Before All Ants Fall Out of a Plank
Related Topics
How Interview Coder Helps
Get real-time assistance for Last Moment Before All Ants Fall Out of a Plank problems during coding interviews. Interview Coder provides instant solutions and explanations.
Examples
n = 4, left = [4,3], right = [0,1]4In the image above: -The ant at index 0 is named A and going to the right. -The ant at index 1 is named B and going to the right. -The ant at index 3 is named C and going to the left. -The ant at index 4 is named D and going to the left. The last moment when an ant was on the plank is t = 4 seconds. After that, it falls immediately out of the plank. (i.e., We can say that at t = 4.0000000001, there are no ants on the plank).
n = 7, left = [], right = [0,1,2,3,4,5,6,7]7All ants are going to the right, the ant at index 0 needs 7 seconds to fall.
n = 7, left = [0,1,2,3,4,5,6,7], right = []7All ants are going to the left, the ant at index 7 needs 7 seconds to fall.
Constraints
1 <= n <= 1040 <= left.length <= n + 10 <= left[i] <= n0 <= right.length <= n + 10 <= right[i] <= n1 <= left.length + right.length <= n + 1All values of left and right are unique, and each value can appear only in one of the two arrays.How Interview Coder Helps with Leetcode Problems
Trust anchors reduce friction for conversion. Reinforce undetectability claims, platform compatibility, user counts, and the free trial to remove perceived risk.
See Interview Coder in Action
Watch how Interview Coder helps solve LeetCode problems during live interviews
Undetectability Checklist
Platform Compatibility
User results and traction
More than 87,000 developers use Interview Coder and early launch metrics showed rapid adoption. Social proof signals that this approach helps real candidates land offers across a range of companies.
Undetectability and technical details
Our native desktop architecture avoids common detection vectors used by browser extensions. We provide a clear checklist so you can run basic checks and confirm the app will be invisible during live interviews.
Platform compatibility and limitations
We work with Zoom, HackerRank, CodeSignal, CoderPad and other web based platforms, with a known list of app version caveats. Check the compatibility note and request a browser link if a specific desktop app is unsupported.
Frequently Asked Questions
Common questions about solving Last Moment Before All Ants Fall Out of a Plank and using Interview Coder during coding interviews.
Interview Coder generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
Ready to Get Started?
Download Interview Coder now and join thousands of developers who have aced their coding interviews