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How to Solve Number of Ways to Earn Points Problem
Master the Number of Ways to Earn Points LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#2585
LeetCode ProblemNumber of Ways to Earn Points
There is a test that has n types of questions. You are given an integer target and a 0-indexed 2D integer array types where types[i] = [counti, marksi] indicates that there are counti questions of the ith type, and each one of them is worth marksi points. Return the number of ways you can earn exactly target points in the exam. Since the answer may be too large, return it modulo 109 + 7. Note that questions of the same type are indistinguishable.
ArrayDynamic Programming
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Problem Breakdown
Understanding the Number of Ways to Earn Points Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There is a test that has n types of questions. You are given an integer target and a 0-indexed 2D integer array types where types[i] = [counti, marksi] indicates that there are counti questions of the ith type, and each one of them is worth marksi points. Return the number of ways you can earn exactly target points in the exam. Since the answer may be too large, return it modulo 109 + 7. Note that questions of the same type are indistinguishable.
HardProblem #2585
LeetCodeNumber of Ways to Earn Points
Related Topics
ArrayDynamic Programming
How Phantom Code Helps
Get real-time assistance for Number of Ways to Earn Points problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
target = 6, types = [[6,1],[3,2],[2,3]]
Output
7
# Example 2
Input
target = 5, types = [[50,1],[50,2],[50,5]]
Output
4
# Example 3
Input
target = 18, types = [[6,1],[3,2],[2,3]]
Output
1
Constraints
1 <= target <= 1000
n == types.length
1 <= n <= 50
types[i].length == 2
1 <= counti, marksi <= 50
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Solve Number of Ways to Earn Points — There is a test that has n types of questions. You are given an integer target a...
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 Number of Ways to Earn Points and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Number of Ways to Earn Points 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 Number of Ways to Earn Points?
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 Number of Ways to Earn Points?
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 Number of Ways to Earn Points 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 Number of Ways to Earn Points 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 Number of Ways to Earn Points 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 Number of Ways to Earn Points 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 Number of Ways to Earn Points 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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