583 of 583 problems written (100%). Every article has a brute-force to optimal walkthrough with Java code that compiles and passes its own tests.

• Basics54 / 54 written
• Sorting7 / 7 written
• Arrays50 / 50 written
• Binary Search37 / 37 written
• Strings32 / 32 written
• Linked List44 / 44 written
• Recursion and Backtracking30 / 30 written
• Bit Manipulation22 / 22 written
• Stacks and Queues33 / 33 written
• Sliding Window and Two Pointers15 / 15 written
• Heaps22 / 22 written
• Greedy Algorithms18 / 18 written
• Binary Trees49 / 49 written
• Binary Search Trees25 / 25 written
• Graphs72 / 72 written
• Dynamic Programming66 / 66 written
• Tries7 / 7 written