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1. Two SumEasy

👍 58.2K👎 1.9KCompaniesHint

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

Example 1:

Input: nums = [2,7,11,15], target = 9

Output: [0,1]

Explanation: nums[0] + nums[1] == 9

Constraints:

2 ≤ nums.length ≤ 10⁴
-10⁹ ≤ nums[i] ≤ 10⁹
Only one valid answer exists.

class Solution:

def twoSum(self, nums: List[int], target: int) -> List[int]:

seen = {}

for i, num in enumerate(nums):

complement = target - num

if complement in seen:

return [seen[complement], i]

seen[num] = i

return []

1. Two SumEasy

👍 58.2K👎 1.9KCompaniesHint

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

Example 1:

Input: nums = [2,7,11,15], target = 9

Output: [0,1]

Explanation: nums[0] + nums[1] == 9

Constraints:

2 ≤ nums.length ≤ 10⁴
-10⁹ ≤ nums[i] ≤ 10⁹
Only one valid answer exists.

class Solution:

def twoSum(self, nums: List[int], target: int) -> List[int]:

seen = {}

for i, num in enumerate(nums):

complement = target - num

if complement in seen:

return [seen[complement], i]

seen[num] = i

return []

Interview Sidekick

Live

Coding Problem

Two Sum - Find indices that add to target

Optimal ApproachO(n)

Use HashMap:

Store num → index

Check complement

Return indices

seen[num] = i → O(1) lookup

1.2s

With Interview Sidekick

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CoderPadtwo_sum.py

1. Two Sum. Return indices of the two numbers that add up to target.

1  def two_sum(nums, target):
2      # brute force?
3      for i in range(len(nums)):
4

08:14Code ModeScreenshot read

Approach: one pass with a hash map of value to index. For each number, check if target - n was already seen.

seen = {}
for i, n in enumerate(nums):
    if target - n in seen:
        return [seen[target - n], i]
    seen[n] = i

Time O(n)Space O(n)Say it: trade memory for speed

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Why Candidates Fail Coding Interviews

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Whiteboard Pressure
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CoderPadtwo_sum.py

1. Two Sum. Return indices of the two numbers that add up to target.

1  def two_sum(nums, target):
2      # brute force?
3      for i in range(len(nums)):
4

08:14Code ModeScreenshot read

Approach: one pass with a hash map of value to index. For each number, check if target - n was already seen.

seen = {}
for i, n in enumerate(nums):
    if target - n in seen:
        return [seen[target - n], i]
    seen[n] = i

Time O(n)Space O(n)Say it: trade memory for speed

Instant Code Suggestions

AI listens to the problem
Understands constraints
Suggests optimal approaches

Step-by-Step Logic

Pseudocode & edge cases
Time & space complexity
Clean explanations to verbalize

How Coding Interview Copilot Works

Get started in minutes. No complicated setup required.

1
Join Your Interview
No setup. No switching tabs. Just open alongside your video call.
2
Get Real-Time Guidance
AI understands the question and context as it's asked.
3
Explain & Implement
You stay in control. The AI supports your answers.

Works with your favorite languages

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JavaScript
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C++
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The Proof Is in the Comparison

Compare side-by-side and find out why Interview Sidekick stays invisible where others fail.

Undetectability features	Interview Sidekick	Final Round AI	LockedIn AI	Interview Coder
Supports Audio	Yes	Yes	Yes	Yes
Invisible In Dock	Yes	No	Yes	Yes
Invisible To Screen Share	Yes	Yes	Yes	Yes
Invisible To System Monitor	Yes	No	Yes	Yes
Click-Through Undetectability	Yes	No	No	No
Hasn't Been Caught	Yes	No	No	Yes
Affordable Price	Yes	No	Yes	No
Undetectable By Browser	Yes	Yes	Yes	Yes
Has Real Proof From Real Users	Yes	Yes	Yes	Yes

Frequently Asked Questions

Questions? Email me! I'll reply as soon as I can.

ben@interviewsidekick.com

No. Our Stealth Mode makes Interview Sidekick completely invisible to screen recording and sharing software. It won't show up on Zoom, Google Meet, Microsoft Teams, or any other platform. Your interviewers will never know you're using it.

Yes! Interview Sidekick works with all major coding interview platforms including CoderPad, HackerRank, LeetCode, CodeSignal, and more. It runs separately from your browser so there's no extension to detect.

Interview Sidekick is a preparation and assistance tool. How you use it is your choice. We designed it to help candidates who struggle with interview anxiety perform closer to their true abilities.

We support all major languages including Python, Java, JavaScript, TypeScript, C++, Go, Rust, C#, Ruby, and Swift. The AI adapts its suggestions to match your preferred language.

No. Interview Sidekick is most effective when combined with solid preparation. Think of it as a safety net that helps you perform your best when nerves kick in, not a replacement for understanding data structures and algorithms.

Our AI generates suggestions in under 2 seconds. You'll receive helpful hints while the interviewer is still explaining the problem, giving you time to formulate your approach.

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Join thousands who've landed their dream jobs after practicing with us.

4.8 from 2,500+ reviews

★★★★★

Hired at Amazon

“The real-time assistant saved me during my technical interview. When I got stuck on a dynamic programming problem, it quietly suggested the right approach. I stayed calm, worked through it, and got the offer.”

DavidSoftware Engineer

The comebackAnonymized

8 → 58

real-interview score, inside a month

Score across real interviews+50 pts

8 Interview 158 Interview 258 Interview 3

Used the live assistant during real interviews

Cloud Integration EngineerEnterprise data platform

★★★★★

Hired at Google

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★★★★★

Hired at Meta

“SQL and case study prep were my weak spots. After a week of daily practice sessions, I walked into my Meta interview feeling like I'd already done it before. Got the offer two days later!”

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Sharper deliveryAnonymized

36 → 68

score up, filler words cut by two-thirds

Practice score over 9 days+32 pts

36 Day 152 Day 460 Day 768 Day 9

Used mock practice to fix delivery — before the interviews

Trust & Safety AnalystBig Tech · scaled-abuse

★★★★★

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“Portfolio presentations always made me ramble. The AI helped me tighten my case study walkthrough from 20 minutes to 8 minutes of clear, impactful storytelling.”

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Mastered the copilotAnonymized

58 → 72

specificity — answered in her own voice

Specificity, live (first → best)+14 pts

58 First72 Best

Learned to wield the live assistant in real interviews

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★★★★★

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“The culture fit questions were spot-on for Netflix. I practiced articulating my creative process and decision-making style, which came up word-for-word in my actual interview.”

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The power userAnonymized

22 → 78

practice score — then 819 live answers

Practice score over 5 weeks+56 pts

22 Wk 148 Wk 262 Wk 478 Wk 5

Typed + voice assist across a 5-week job hunt

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4.8 from 2,500+ reviews

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Real-Time Coding InterviewCopilot

Built for FAANG & Top Tech Company Interviews

Why Candidates Fail Coding Interviews

Real-Time Coding Help During Live Interviews

Instant Code Suggestions

Step-by-Step Logic

How Coding Interview Copilot Works

Join Your Interview

Get Real-Time Guidance

Explain & Implement

The Proof Is in the Comparison

Frequently Asked Questions

What People Are Saying

Code Smarter. Interview Better.

Real-Time Coding Interview
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