LeetcodeDynamic Programming
Master Unbounded Knapsack DP: Coin Change & Beyond
Master Unbounded Knapsack DP by deriving Coin Change and Coin Change II from first principles. Two LeetCode classics, one forward-loop template.
14 min read
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LeetcodeDynamic Programming
Master 0/1 Knapsack DP: Subset Sum, Target Sum & Beyond
Master the 0/1 Knapsack DP pattern by deriving Partition Equal Subset Sum and Target Sum from first principles. Two LeetCode classics, one template.
14 min read
LeetcodeGraphs
Union-Find: The 20-Line O(1) Trick
Master Union-Find with path compression and union by rank. Interactive playground lets you merge sets and watch trees flatten in real time.
14 min read
LeetcodeDynamic Programming
Bitmask DP: A Set Is Just an Integer
Master Bitmask Dynamic Programming. Build dp[mask] intuition, see why backtracking explodes, and derive K Equal Subsets and Work Sessions like a candidate
13 min read
LeetcodeDynamic Programming
Master Grid DP: Unique Paths, Min Path Sum & Beyond
Master the Grid DP pattern by deriving Unique Paths and Minimum Path Sum from first principles. One cell-by-cell template, two LeetCode classics.
13 min read
LeetcodeDynamic Programming
Decision DP: Choose, Jump, Repeat
Master Decision Dynamic Programming. Build dp[i] intuition, see why greedy fails, and derive Job Scheduling and Min Cost Tickets like a candidate.
13 min read
LeetcodeDynamic Programming
State Machine DP: Hold, Sell, Repeat
Master state machine DP with stocks. Build the holding-vs-cash mental model and crack Best Time to Buy and Sell Stock I and with Cooldown.
13 min read
LeetcodeDynamic Programming
Master Linear DP: Climbing Stairs, House Robber & Beyond
Master the Linear DP pattern by deriving Climbing Stairs and House Robber from first principles. One template, five lines, dozens of LeetCode wins.
14 min read
LeetcodeDynamic Programming
Bounded Knapsack DP: Pack Under Two Caps
Master Bounded Knapsack DP. Add a dimension per constraint, loop backwards, and crack Ones and Zeroes and Profitable Schemes like a candidate.
13 min read
LeetcodeGraphs
How AWS Connects 33 Regions: Kruskal's Algorithm
See how AWS-style networks find the cheapest way to connect every region. Interactive visualizer, Python walkthrough, and pattern recognition guide.
14 min read
LeetcodeGraphs
Prim's Algorithm: MST Step by Step
Step through Prim's algorithm visually. See how a min-heap grows the minimum spanning tree, with interactive simulator and Python code.
12 min read
LeetcodeGraphs
Netflix Recommendation Loops: Tarjan's Algorithm
How Tarjan's algorithm finds recommendation loops in directed graphs. Netflix-style example, interactive visualizer, Python benchmarks.
14 min read