Next Greater Element in Circular Array | GfG POTD | 07-07-25 | GfG Problem of the day| GeeksforGeeks

Today’s GfG POTD: Next Greater Element in Circular Array
GfG Link → https://www.geeksforgeeks.org/problems/next-greater-element/1
Code → https://github.com/imnilesh18/GfG-POTD/blob/master/07_July/07_Next%20Greater%20Element%20in%20Circular%20Array.cpp

⏱ Video Chapters
00:00 - Introduction
00:14 - Problem Statement
01:28 - Brute‑Force (O(n²)) Approach & Intuition
02:30 - Full Dry‑Run of Brute‑Force
05:40 - Brute‑Force Code
06:43 - Optimized Monotonic Stack (O(n)) Approach & Intuition
09:14 - Dry‑Run of Stack Approach
19:47 - Stack‑Based Code
23: - Time & Space Complexity

🔑 Primary Keywords
NextGreaterElement, CircularArray, GfGPOTD, LeetGeek, GeekStreak2025, BruteForce, MonotonicStack, StackApproach, ArrayAlgorithms, CompetitiveProgramming, CodingInterviewPrep, DataStructures, AlgorithmDesign, ProblemOfTheDay, DailyCodingChallenge, CPlusPlus, Java, TimeComplexity, SpaceComplexity, DryRun, CodeWalkthrough, CircularTraversal, InterviewQuestions, CodingTutorial, SoftwareEngineering, TechEducation, EfficientAlgorithms, InterviewPrep, OptimizationPatterns

🧾 Problem Statement
Given a circular integer array arr[], find the next greater element (NGE) for each element. The NGE of arr[i] is the first element greater than arr[i] when traversing circularly; if none exists, return -1.

Constraints
1 ≤ n ≤ 10⁵
0 ≤ arr[i] ≤ 10⁶

📊 Example Inputs & Outputs
Example 1
Input: [1, 3, 2, 4] → Output: [3, 4, 4, -1]
Example 2
Input: [0, 2, 3, 1, 1] → Output: [2, 3, -1, 2, 2]

🧠 What You’ll Learn
Brute‑Force O(n²) circular scan method
Full dry‑run walkthrough with modulo indexing
Clean C++ & Java implementations of brute‑force
Optimized O(n) monotonic‑stack approach
Dry‑run showing how the stack “resolves” waiting indices
Code walkthrough for stack solution in both languages
Precise time & space complexity analysis
Edge‑case handling and best practices for circular problems

📂 Resources & Code
GfG Problem Statement → https://www.geeksforgeeks.org/problems/next-greater-element/1
GitHub Solutions (C++ & Java) → https://github.com/imnilesh18/GfG-POTD/blob/master/07_July/07_Next%20Greater%20Element%20in%20Circular%20Array.cpp
Full Repository → https://github.com/imnilesh18/GfG-POTD

🚀 Why Watch?
Master a classic “next greater” problem with circular twists. Compare the naïve brute‑force scan to an elegant O(n) stack‑based solution, complete with full dry‑runs and dual‑language code walkthroughs. Level up your DSA skills and ace your next interview question!

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🔖 Tags
#NextGreaterElement #CircularArray #GfGPOTD #LeetGeek #GeekStreak2025 #BruteForce #MonotonicStack #StackApproach #ArrayAlgorithms #CompetitiveProgramming #CodingInterviewPrep #DataStructures #AlgorithmDesign #ProblemOfTheDay #DailyCodingChallenge #CPlusPlus #Java #TimeComplexity #SpaceComplexity #DryRun #CodeWalkthrough #CircularTraversal #InterviewQuestions #CodingTutorial #SoftwareEngineering #TechEducation #EfficientAlgorithms #InterviewPrep #OptimizationPatterns #Tutorial #VisualDryRun #CleanCode #StepByStep #EdgeCaseHandling #PerformanceOptimization #LearnWithExamples #SubscribeNow #CodingChallenges #ProblemSolving #StackPattern #CodingPatterns #VideoTutorial #YouTubeTutorial #NextGreaterClassic #ProgrammingTutorial #CodeAlong #TechTips #AlgorithmTutorial #CodingTips #GeekForGeeksTutorial #DSA #DSAinCpp #DSAinJava #SoftwareDev #AlgorithmPatterns #DataStructuresAndAlgorithms #GeekCommunity

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