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How to Solve Numbers At Most N Given Digit Set Problem
Master the Numbers At Most N Given Digit Set LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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LeetCode ProblemNumbers At Most N Given Digit Set
Given an array of digits which is sorted in non-decreasing order. You can write numbers using each digits[i] as many times as we want. For example, if digits = ['1','3','5'], we may write numbers such as '13', '551', and '1351315'. Return the number of positive integers that can be generated that are less than or equal to a given integer n.
ArrayMathStringBinary SearchDynamic Programming
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Problem Breakdown
Understanding the Numbers At Most N Given Digit Set Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given an array of digits which is sorted in non-decreasing order. You can write numbers using each digits[i] as many times as we want. For example, if digits = ['1','3','5'], we may write numbers such as '13', '551', and '1351315'. Return the number of positive integers that can be generated that are less than or equal to a given integer n.
HardProblem #902
LeetCodeNumbers At Most N Given Digit Set
Related Topics
ArrayMathStringBinary SearchDynamic Programming
How Phantom Code Helps
Get real-time assistance for Numbers At Most N Given Digit Set problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
digits = ["1","3","5","7"], n = 100
Output
20
# Example 2
Input
digits = ["1","4","9"], n = 1000000000
Output
29523
# Example 3
Input
digits = ["7"], n = 8
Output
1
Constraints
1 <= digits.length <= 9
digits[i].length == 1
digits[i] is a digit from '1' to '9'.
All the values in digits are unique.
digits is sorted in non-decreasing order.
1 <= n <= 109
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Solve Numbers At Most N Given Digit Set — Given an array of digits which is sorted in non-decreasing order. You can write ...
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 Numbers At Most N Given Digit Set and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Numbers At Most N Given Digit Set 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 Numbers At Most N Given Digit Set?
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 Numbers At Most N Given Digit Set?
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 Numbers At Most N Given Digit Set 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 Numbers At Most N Given Digit Set 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 Numbers At Most N Given Digit Set 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 Numbers At Most N Given Digit Set 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 Numbers At Most N Given Digit Set 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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