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1047 Student List for Course Zhejiang University has 40,000 students and provides 2,500 courses. Now given the registered course list of each student, 阅读全文
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1004 Counting Leaves A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. Input Sp 阅读全文
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1094 The Largest Generation A family hierarchy is usually presented by a pedigree tree where all the nodes on the same level belong to the same genera 阅读全文
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1090 Highest Price in Supply Chain A supply chain is a network of retailers(零售商), distributors(经销商), and suppliers(供应商)-- everyone involved in moving 阅读全文
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1079 Total Sales of Supply Chain A supply chain is a network of retailers(零售商), distributors(经销商), and suppliers(供应商)– everyone involved in moving a p 阅读全文
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1102 Invert a Binary Tree The following is from Max Howell @twitter: Google: 90% of our engineers use the software you wrote (Homebrew), but you can’t 阅读全文
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1086 Tree Traversals Again An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6 阅读全文
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1020 Tree Traversals Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, y 阅读全文
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1098 Insertion or Heap Sort According to Wikipedia: Insertion sort iterates, consuming one input element each repetition, and growing a sorted output 阅读全文