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PS DP Algorithm Number Theory Ad-Hoc Solutions Parametric Search Two pointer HLD Math Linear Algebra Disjoint Set Sweeping Data Structure Segment Tree Divide and Conquer Lazy propagation Fenwick Tree Ternary Search Sliding Window 2D Segment Tree Greedy imos method Trie Small to Large Trick BFS Tree Convex Hull Trick ICPC Review Divide and Conquer Optimization Persistent Segment Tree NCF