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How to Solve Two Sum II - Input Array Is Sorted Problem
Master the Two Sum II - Input Array Is Sorted LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#167
LeetCode ProblemTwo Sum II - Input Array Is Sorted
Given a 1-indexed array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number. Let these two numbers be numbers[index1] and numbers[index2] where 1 <= index1 < index2 <= numbers.length. Return the indices of the two numbers, index1 and index2, added by one as an integer array [index1, index2] of length 2. The tests are generated such that there is exactly one solution. You may not use the same element twice. Your solution must use only constant extra space.
ArrayTwo PointersBinary Search
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Problem Breakdown
Understanding the Two Sum II - Input Array Is Sorted Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a 1-indexed array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number. Let these two numbers be numbers[index1] and numbers[index2] where 1 <= index1 < index2 <= numbers.length. Return the indices of the two numbers, index1 and index2, added by one as an integer array [index1, index2] of length 2. The tests are generated such that there is exactly one solution. You may not use the same element twice. Your solution must use only constant extra space.
MediumProblem #167
LeetCodeTwo Sum II - Input Array Is Sorted
Related Topics
ArrayTwo PointersBinary Search
How Phantom Code Helps
Get real-time assistance for Two Sum II - Input Array Is Sorted problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
numbers = [2,7,11,15], target = 9
Output
[1,2]
# Example 2
Input
numbers = [2,3,4], target = 6
Output
[1,3]
# Example 3
Input
numbers = [-1,0], target = -1
Output
[1,2]
Constraints
2 <= numbers.length <= 3 * 104
-1000 <= numbers[i] <= 1000
numbers is sorted in non-decreasing order.
-1000 <= target <= 1000
The tests are generated such that there is exactly one solution.
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Solve Two Sum II - Input Array Is Sorted — Given a 1-indexed array of integers numbers that is already sorted in non-decrea...
Here's the optimal approach using Array:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Two Sum II - Input Array Is Sorted and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Two Sum II - Input Array Is Sorted during interviews?
Phantom Code 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.
What if the interviewer asks follow-up questions or modifications to problems like Two Sum II - Input Array Is Sorted?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Two Sum II - Input Array Is Sorted?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Two Sum II - Input Array Is Sorted type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Two Sum II - Input Array Is Sorted interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Two Sum II - Input Array Is Sorted during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Two Sum II - Input Array Is Sorted style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Two Sum II - Input Array Is Sorted interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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