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How to Solve Adding Spaces to a String Problem
Master the Adding Spaces to a String LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
Phantom Code generates complete solutions and debugging hints that you can use while explaining your approach, so you stay calm and in control.
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Start Free for WindowsMedium#2109
LeetCode ProblemAdding Spaces to a String
You are given a 0-indexed string s and a 0-indexed integer array spaces that describes the indices in the original string where spaces will be added. Each space should be inserted before the character at the given index. Return the modified string after the spaces have been added.
ArrayTwo PointersStringSimulation
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Problem Breakdown
Understanding the Adding Spaces to a String Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a 0-indexed string s and a 0-indexed integer array spaces that describes the indices in the original string where spaces will be added. Each space should be inserted before the character at the given index. Return the modified string after the spaces have been added.
MediumProblem #2109
LeetCodeAdding Spaces to a String
Related Topics
ArrayTwo PointersStringSimulation
How Phantom Code Helps
Get real-time assistance for Adding Spaces to a String problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "LeetcodeHelpsMeLearn", spaces = [8,13,15]
Output
"Leetcode Helps Me Learn"
# Example 2
Input
s = "icodeinpython", spaces = [1,5,7,9]
Output
"i code in py thon"
# Example 3
Input
s = "spacing", spaces = [0,1,2,3,4,5,6]
Output
" s p a c i n g"
Constraints
1 <= s.length <= 3 * 105
s consists only of lowercase and uppercase English letters.
1 <= spaces.length <= 3 * 105
0 <= spaces[i] <= s.length - 1
All the values of spaces are strictly increasing.
How Phantom Code Helps with LeetCode Problems
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Solve Adding Spaces to a String — You are given a 0-indexed string s and a 0-indexed integer array spaces that des...
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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Undetectability Checklist
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Platform Compatibility
Zoom
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Google Meet
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HackerRank
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CodeSignal
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CoderPad
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Teams
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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.
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We work with Zoom, HackerRank, CodeSignal, CoderPad and other web-based platforms. Check the compatibility note and request a browser link if a specific desktop app is unsupported.
Frequently Asked Questions
Common questions about solving Adding Spaces to a String and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Adding Spaces to a String 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 Adding Spaces to a String?
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 Adding Spaces to a String?
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 Adding Spaces to a String 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 Adding Spaces to a String 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 Adding Spaces to a String 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 Adding Spaces to a String 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 Adding Spaces to a String 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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