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How to Solve Smallest Index With Digit Sum Equal to Index Problem
Master the Smallest Index With Digit Sum Equal to Index 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 WindowsEasy#3550
LeetCode ProblemSmallest Index With Digit Sum Equal to Index
You are given an integer array nums. Return the smallest index i such that the sum of the digits of nums[i] is equal to i. If no such index exists, return -1.
ArrayMath
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Problem Breakdown
Understanding the Smallest Index With Digit Sum Equal to Index Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given an integer array nums. Return the smallest index i such that the sum of the digits of nums[i] is equal to i. If no such index exists, return -1.
EasyProblem #3550
LeetCodeSmallest Index With Digit Sum Equal to Index
Related Topics
ArrayMath
How Phantom Code Helps
Get real-time assistance for Smallest Index With Digit Sum Equal to Index problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
nums = [1,3,2]
Output
2
# Example 2
Input
nums = [1,10,11]
Output
1
# Example 3
Input
nums = [1,2,3]
Output
-1
Constraints
1 <= nums.length <= 100
0 <= nums[i] <= 1000
How Phantom Code Helps with LeetCode Problems
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Solve Smallest Index With Digit Sum Equal to Index — You are given an integer array nums. Return the smallest index i such that the s...
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 Smallest Index With Digit Sum Equal to Index and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Smallest Index With Digit Sum Equal to Index 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 Smallest Index With Digit Sum Equal to Index?
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 Smallest Index With Digit Sum Equal to Index?
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 Smallest Index With Digit Sum Equal to Index 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 Smallest Index With Digit Sum Equal to Index 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 Smallest Index With Digit Sum Equal to Index 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 Smallest Index With Digit Sum Equal to Index 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 Smallest Index With Digit Sum Equal to Index 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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