Permutations, combinations, and Pascal’s Triangle.
Binary Search Trees, Heaps (Priority Queues), Adjacency Lists, and Disjoint Set Union (DSU). competitive programming essentials
✅ Master one language (C++/Python/Java) ✅ Understand Big O and constraints ✅ Learn 5–7 core data structures ✅ Know 10–12 essential algorithms ✅ Practice I/O speed tricks ✅ Solve problems daily (even 1 is enough) ✅ Review others’ solutions ✅ Participate in contests regularly Permutations, combinations, and Pascal’s Triangle