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Count the Number of Good Subarrays – Apple OA DSA Problem & Java Solution
An interesting subarray-removal problem where the remaining elements must form a strictly increasing array.
LeetCode 3483: Unique 3-Digit Even Numbers – Java Backtracking Solution
Generate all possible three-digit numbers with backtracking, handle duplicate digits correctly, and count only distinct even numbers.
LeetCode 2086: Minimum Number of Food Buckets to Feed the Hamsters – Java Greedy Solution
Solve the hamster feeding problem using a simple greedy strategy, efficiently placing buckets while detecting impossible arrangements.
LeetCode 2265: Count Nodes Equal to Average of Subtree – Java DFS Solution
Understand subtree sum and node counting with DFS, explore a straightforward recursive solution, optimize it using a shared counter, and finally reach an O(n) postorder solution.
LeetCode 845: Longest Mountain in Array – Java Solution with Peak Expansion
Learn how to identify mountain peaks, expand in both directions, and find the longest valid mountain subarray using O(n) time and O(1) extra space.
LeetCode 41: First Missing Positive – O(n) Time and O(1) Space Java Solution
A complete explanation of the cyclic placement technique for finding the smallest missing positive integer in an unsorted array.
LeetCode 55: Jump Game – Java Greedy Solution with Explanation and Dry Run
Learn how to solve LeetCode 55 Jump Game using a simple greedy approach by tracking the farthest index reachable at every step.
LeetCode 1189: Maximum Number of Balloons – Java HashMap and Frequency Counting Solution
SEO Subtitle Learn Multiple Approaches, Frequency Analysis, Dry Run, Complexity Breakdown, and Interview Insights for This Popular String Counting Problem
LeetCode 1833: Maximum Ice Cream Bars – Java Greedy & Counting Sort Solution Explained
Learn Greedy Algorithms, Counting Sort Optimization, Dry Runs, Complexity Analysis, and Interview Strategies Through This Classic Budget Allocation Problem