Latest Articles
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LeetCode 769: Max Chunks To Make Sorted – Java Solution, Approach & Explanation
Learn how to split a permutation into the maximum number of independently sortable chunks using recursion, partitioning, and a greedy optimization.
LeetCode 836: Rectangle Overlap – Java Solution, Explanation & Approach
Check whether two axis-aligned rectangles have a positive-area intersection using simple coordinate and boundary conditions.
LeetCode 835: Image Overlap – Java Matrix Translation Solution
Find the maximum overlap between two binary images by translating one matrix in every possible direction.
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.