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How to Solve Count of Integers Problem
Master the Count of Integers LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#2719
LeetCode ProblemCount of Integers
You are given two numeric strings num1 and num2 and two integers max_sum and min_sum. We denote an integer x to be good if: Return the number of good integers. Since the answer may be large, return it modulo 109 + 7. Note that digit_sum(x) denotes the sum of the digits of x.
MathStringDynamic Programming
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Problem Breakdown
Understanding the Count of Integers Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given two numeric strings num1 and num2 and two integers max_sum and min_sum. We denote an integer x to be good if: Return the number of good integers. Since the answer may be large, return it modulo 109 + 7. Note that digit_sum(x) denotes the sum of the digits of x.
HardProblem #2719
LeetCodeCount of Integers
Related Topics
MathStringDynamic Programming
How Phantom Code Helps
Get real-time assistance for Count of Integers problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
num1 = "1", num2 = "12", min_sum = 1, max_sum = 8
Output
11
# Example 2
Input
num1 = "1", num2 = "5", min_sum = 1, max_sum = 5
Output
5
Constraints
1 <= num1 <= num2 <= 1022
1 <= min_sum <= max_sum <= 400
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Solve Count of Integers — You are given two numeric strings num1 and num2 and two integers max_sum and min...
Here's the optimal approach using Math:
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 Count of Integers and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Count of Integers 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 Count of Integers?
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 Count of Integers?
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 Count of Integers 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 Count of Integers 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 Count of Integers 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 Count of Integers 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 Count of Integers 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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