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Practice index

This index is the starting point for locating and revisiting problem solutions. The source platform is recorded as metadata; directories are organized by the data structure or algorithmic technique used.

Reimplementation convention

Keep a reviewed solution in the existing problem package. Retain the original as ProblemSolution.java and name later attempts with the review date, such as Review2026_09.java. This keeps attempts comparable without creating a second copy of the problem elsewhere.

Topics

Topic Source directory
Arrays and matrices arraymatrix
Divide and conquer divideandconquer
Graphs graph
Greedy algorithms greedy
Hash tables and sets hash, hashset
Heaps heap
Linked lists linkedlist
Queues queue
Stacks stack
Trees tree
Tries trie

Add a problem

  1. Put the solution in the existing topic package, or create a new topic package when necessary.
  2. Add the problem title, source, topic, and last-review date to the relevant table below.
  3. On a revisit, add a dated ReviewYYYY_MM.java implementation in the same package and update the review date.

Problem catalog

Add entries here as problems are created or reviewed.

Problem Topic Source Implementations Last reviewed
Two Sum Hash tables and sets LeetCode ProblemSolution.java, Review2026_09_26.java 2026-09-26
Valid Anagram Hash tables and sets LeetCode ProblemSolution.java, Review2026_09_27.java 2026-09
Merge Two Sorted Lists Linked lists LeetCode ProblemSolution.java, Review2026_09_28.java 2026-09
Valid Parentheses Stacks LeetCode ProblemSolution.java, Review2026_09_28.java 2026-09
Valid Palindrome Arrays and matrices LeetCode Review2026_09_29.java 2026-09
Find First Palindromic String in the Array Arrays and matrices LeetCode Review2026_09_29.java, Review2026_09_30.java 2026-09
Linked List Cycle Linked lists LeetCode Review2026_09_29.java 2026-09
Reverse Linked List Linked lists LeetCode ProblemSolution.java, Review2026_10_01.java 2026-10
Longest Palindrome Hash tables and sets LeetCode ProblemSolution.java, Review2026_10_03.java 2026-10