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PAT 1022. Digital Library A Digital Library contains millions of books, stored according to their titles, authors, key words of their abstracts, publi 阅读全文
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PAT 1021. Deepest Root A graph which is connected and acyclic can be considered a tree. The height of the tree depends on the selected root. Now you a 阅读全文
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PAT 1020. Tree Traversals Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequenc 阅读全文