Concepts2
⚙️AlgorithmIntermediate
Think Backwards (Reverse Thinking)
Think Backwards is a problem‑solving pattern where you reverse time or direction so hard deletions become easy insertions and the final state becomes the starting point.
#think backwards#reverse thinking#offline queries+12
🗂️Data StructureIntermediate
DSU with Weighted Edges
A DSU with weighted edges (also called a potential or difference-constraint union-find) maintains relative values between elements while still supporting near-constant-time merges and finds.
#dsu#union-find#weighted edges+11