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set (1) dynamic-programming (6) stack (2) linked-list (1) hash (2) heap (1) binary-search (3) tree (1) tree-bfs (1) sliding-window (3) graph-dfs (2) two-pointers (2) array (1) backtrack (3) difference-array (1) greedy (3) monotonic-stack (1) general-binary-search (1) prefix-sum (1) expand-around-corner (1) range (3) trie (1) gcd (2)