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How to Solve Number of Excellent Pairs Problem
Master the Number of Excellent Pairs LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#2354
LeetCode ProblemNumber of Excellent Pairs
You are given a 0-indexed positive integer array nums and a positive integer k. A pair of numbers (num1, num2) is called excellent if the following conditions are satisfied: Return the number of distinct excellent pairs. Two pairs (a, b) and (c, d) are considered distinct if either a != c or b != d. For example, (1, 2) and (2, 1) are distinct. Note that a pair (num1, num2) such that num1 == num2 can also be excellent if you have at least one occurrence of num1 in the array.
ArrayHash TableBinary SearchBit Manipulation
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Problem Breakdown
Understanding the Number of Excellent Pairs 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 positive integer array nums and a positive integer k. A pair of numbers (num1, num2) is called excellent if the following conditions are satisfied: Return the number of distinct excellent pairs. Two pairs (a, b) and (c, d) are considered distinct if either a != c or b != d. For example, (1, 2) and (2, 1) are distinct. Note that a pair (num1, num2) such that num1 == num2 can also be excellent if you have at least one occurrence of num1 in the array.
HardProblem #2354
LeetCodeNumber of Excellent Pairs
Related Topics
ArrayHash TableBinary SearchBit Manipulation
How Phantom Code Helps
Get real-time assistance for Number of Excellent Pairs problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
nums = [1,2,3,1], k = 3
Output
5
# Example 2
Input
nums = [5,1,1], k = 10
Output
0
Constraints
1 <= nums.length <= 105
1 <= nums[i] <= 109
1 <= k <= 60
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Solve Number of Excellent Pairs — You are given a 0-indexed positive integer array nums and a positive integer k. ...
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 Excellent Pairs and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Number of Excellent Pairs 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 Excellent Pairs?
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 Excellent Pairs?
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 Excellent Pairs 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 Excellent Pairs 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 Excellent Pairs 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 Excellent Pairs 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 Excellent Pairs 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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