自由之翼Az - 博客园

2019年9月6日

摘要： John got a full mark on PAT. He was so happy that he decided to hold a raffle（抽奖） for his followers on Weibo -- that is, he would select winners from 阅读全文

posted @ 2019-09-06 20:01 自由之翼Az 阅读(152) 评论(0) 推荐(0)

PAT甲级——A1123 Is It a Complete AVL Tree【30】

摘要： An AVL tree is a self-balancing binary search tree. In an AVL tree, the heights of the two child subtrees of any node differ by at most one; if at any 阅读全文

posted @ 2019-09-06 19:27 自由之翼Az 阅读(249) 评论(0) 推荐(0)

2019年9月5日

PAT甲级——A1122 Hamiltonian Cycle【25】

摘要： The "Hamilton cycle problem" is to find a simple cycle that contains every vertex in a graph. Such a cycle is called a "Hamiltonian cycle". In this pr 阅读全文

posted @ 2019-09-05 22:38 自由之翼Az 阅读(228) 评论(0) 推荐(0)

PAT甲级——A1121 Damn Single【25】

摘要： "Damn Single (单身狗)" is the Chinese nickname for someone who is being single. You are supposed to find those who are alone in a big party, so they can 阅读全文

posted @ 2019-09-05 22:04 自由之翼Az 阅读(217) 评论(0) 推荐(0)

PAT甲级——A1120 Friend Numbers【20】

摘要： Two integers are called "friend numbers" if they share the same sum of their digits, and the sum is their "friend ID". For example, 123 and 51 are fri 阅读全文

posted @ 2019-09-05 21:33 自由之翼Az 阅读(175) 评论(0) 推荐(0)

PAT甲级——A1119 Pre- and Post-order Traversals【30】

摘要： Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and ino 阅读全文

posted @ 2019-09-05 09:02 自由之翼Az 阅读(264) 评论(0) 推荐(1)

2019年9月4日

PAT甲级——A1118 Birds in Forest【25】

摘要： Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are 阅读全文

posted @ 2019-09-04 21:52 自由之翼Az 阅读(174) 评论(0) 推荐(0)

PAT甲级——A1117 Eddington Number【25】

摘要： British astronomer Eddington liked to ride a bike. It is said that in order to show off his skill, he has even defined an "Eddington number", E -- tha 阅读全文

posted @ 2019-09-04 20:46 自由之翼Az 阅读(163) 评论(0) 推荐(0)

PAT甲级——A1116 Come on! Let's C

摘要： "Let's C" is a popular and fun programming contest hosted by the College of Computer Science and Technology, Zhejiang University. Since the idea of th 阅读全文

posted @ 2019-09-04 20:33 自由之翼Az 阅读(224) 评论(0) 推荐(0)

PAT甲级——A1115 Counting Nodes in a BST【30】

摘要： A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes 阅读全文

posted @ 2019-09-04 09:59 自由之翼Az 阅读(147) 评论(0) 推荐(0)

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