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How to Solve Subsequences with a Unique Middle Mode I Problem
Master the Subsequences with a Unique Middle Mode I LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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LeetCode ProblemSubsequences with a Unique Middle Mode I
Given an integer array nums, find the number of subsequences of size 5 of nums with a unique middle mode. Since the answer may be very large, return it modulo 109 + 7. A mode of a sequence of numbers is defined as the element that appears the maximum number of times in the sequence. A sequence of numbers contains a unique mode if it has only one mode. A sequence of numbers seq of size 5 contains a unique middle mode if the middle element (seq[2]) is a unique mode.
ArrayHash TableMathCombinatorics
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Problem Breakdown
Understanding the Subsequences with a Unique Middle Mode I Problem
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Problem Statement
Given an integer array nums, find the number of subsequences of size 5 of nums with a unique middle mode. Since the answer may be very large, return it modulo 109 + 7. A mode of a sequence of numbers is defined as the element that appears the maximum number of times in the sequence. A sequence of numbers contains a unique mode if it has only one mode. A sequence of numbers seq of size 5 contains a unique middle mode if the middle element (seq[2]) is a unique mode.
HardProblem #3395
LeetCodeSubsequences with a Unique Middle Mode I
Related Topics
ArrayHash TableMathCombinatorics
How Phantom Code Helps
Get real-time assistance for Subsequences with a Unique Middle Mode I problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
nums = [1,1,1,1,1,1]
Output
6
# Example 2
Input
nums = [1,2,2,3,3,4]
Output
4
# Example 3
Input
nums = [0,1,2,3,4,5,6,7,8]
Output
0
Constraints
5 <= nums.length <= 1000
-109 <= nums[i] <= 109
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Solve Subsequences with a Unique Middle Mode I — Given an integer array nums, find the number of subsequences of size 5 of nums w...
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def solve(input):
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Frequently Asked Questions
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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.
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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.
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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 Subsequences with a Unique Middle Mode I during live interviews?
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How does Phantom Code help when I'm struggling with Subsequences with a Unique Middle Mode I 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.
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