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RSS订阅原创 1141 PAT Ranking of Institutions(结构体排序）
After each PAT, the PAT Center will announce the ranking of institutions based on their students’ performances. Now you are asked to generate the ranklist.Input Specification:Each input file contain...
2020-04-26 15:06:05
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原创 1142 Maximal Clique
A clique is a subset of vertices of an undirected graph such that every two distinct vertices in the clique are adjacent. A maximal clique is a clique that cannot be extended by including one more adj...
2020-04-26 14:20:29
229
原创 1143 Lowest Common Ancestor
The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants.A binary search tree (BST) is recursively defined as a binary tree which has t...
2020-04-26 11:49:21
199
原创 1139 First Contact
Unlike in nowadays, the way that boys and girls expressing their feelings of love was quite subtle in the early years. When a boy A had a crush on a girl B, he would usually not contact her directly i...
2020-04-25 14:26:58
358
原创 1138 Postorder Traversal
Suppose that all the keys in a binary tree are distinct positive integers. Given the preorder and inorder traversal sequences, you are supposed to output the first number of the postorder traversal se...
2020-04-25 13:03:00
176
原创 1137 Final Grading
For a student taking the online course “Data Structures” on China University MOOC (http://www.icourse163.org/), to be qualified for a certificate, he/she must first obtain no less than 200 points from...
2020-04-25 11:42:39
268
原创 1136 A Delayed Palindrome
Consider a positive integer N written in standard notation with k+1 digits ai as ak ⋯a1 a0 with 0≤ai <10 for all i and ak >0. Then N is palindromic if and only if...
2020-04-25 11:12:47
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原创 1135 Is It A Red-Black Tree
There is a kind of balanced binary search tree named red-black tree in the data structure. It has the following 5 properties:(1) Every node is either red or black.(2) The root is black.(3) Every le...
2020-04-24 14:42:25
163
原创 1134 Vertex Cover
A vertex cover of a graph is a set of vertices such that each edge of the graph is incident to at least one vertex of the set. Now given a graph with several vertex sets, you are supposed to tell if e...
2020-04-24 13:13:29
154
原创 1133 Splitting A Linked List
Given a singly linked list, you are supposed to rearrange its elements so that all the negative values appear before all of the non-negatives, and all the values in [0, K] appear before all those grea...
2020-04-24 12:42:25
173
原创 1132 Cut Integer
Cutting an integer means to cut a K digits lone integer Z into two integers of (K/2) digits long integers A and B. For example, after cutting Z = 167334, we have A = 167 and B = 334. It is interesting...
2020-04-24 11:06:06
139
原创 1131 Subway Map（DFS)
In the big cities, the subway systems always look so complex to the visitors. To give you some sense, the following figure shows the map of Beijing subway. Now you are supposed to help people with you...
2020-04-23 17:13:05
183
原创 1130 Infix Expression
Given a syntax tree (binary), you are supposed to output the corresponding infix expression, with parentheses reflecting the precedences of the operators.Input Specification:Each input file contains...
2020-04-23 13:20:25
114
原创 1129 Recommendation System
Recommendation system predicts the preference that a user would give to an item. Now you are asked to program a very simple recommendation system that rates the user’s preference by the number of time...
2020-04-23 11:52:22
237
原创 1127 ZigZagging on a Tree（DFS、BFS）
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 inorder traversal sequences. And it is a simple stand...
2020-04-22 15:29:17
219
原创 1128 N Queens Puzzle
The “eight queens puzzle” is the problem of placing eight chess queens on an 8×8 chessboard so that no two queens threaten each other. Thus, a solution requires that no two queens share the same row, ...
2020-04-22 13:24:50
145
原创 1126 Eulerian Path（DFS）
In graph theory, an Eulerian path is a path in a graph which visits every edge exactly once. Similarly, an Eulerian circuit is an Eulerian path which starts and ends on the same vertex. They were firs...
2020-04-22 12:03:01
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原创 1125 Chain the Ropes（贪心）
Given some segments of rope, you are supposed to chain them into one rope. Each time you may only fold two segments into loops and chain them into one piece, as shown by the figure. The resulting chai...
2020-04-22 11:20:25
155
原创 1124 Raffle for Weibo Followers
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 every N followers who forwarded his post, and give ...
2020-04-22 11:05:51
113
原创 1123 Is It a Complete AVL Tree
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 time they differ by more than one, rebalancing is...
2020-04-21 14:51:56
172
原创 1122 Hamiltonian Cycle
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 problem, you are supposed to tell if a given cycle i...
2020-04-21 13:40:45
119
原创 1121 Damn Single
“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 be taken care of.Input Specification:Each input ...
2020-04-21 11:54:47
97
原创 1120 Friend Numbers
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 friend numbers since 1+2+3 = 5+1 = 6, and 6 is their ...
2020-04-21 11:27:31
118
原创 1118 Birds in Forest（并查集）
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 supposed to help the scientists to count the maxi...
2020-04-21 11:18:00
140
原创 1117 Eddington Number
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 – that is, the maximum integer E such that it is for E d...
2020-04-20 15:40:02
134
原创 1119 Pre- and Post-order Traversals
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 inorder traversal sequences, or preorder and inorder ...
2020-04-20 15:06:26
105
原创 1116 Come on! Let's C
“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 the contest is for fun, the award rules are funny as...
2020-04-20 11:46:01
137
原创 1115 Counting Nodes in a BST（DFS）
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 with keys less than or equal to the node’s key.Th...
2020-04-20 11:20:37
82
原创 1114 Family Property（DFS求连通分量）
This time, you are supposed to help us collect the data for family-owned property. Given each person’s family members, and the estate（房产）info under his/her own name, we need to know the size of each f...
2020-04-19 18:27:15
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原创 1113 Integer Set Partition
Given a set of N (> 1) positive integers, you are supposed to partition them into two disjoint sets A1 and A2 of n1 and n2 numbers, respectively. Let S1 and S2 denote the sums of all the numbers in...
2020-04-19 17:02:18
167
原创 1112 Stucked Keyboard
On a broken keyboard, some of the keys are always stucked. So when you type some sentences, the characters corresponding to those keys will appear repeatedly on screen for k times.Now given a resulti...
2020-04-19 16:45:45
178
原创 1111 Online Map（Dijkstra）
Input our current position and a destination, an online map can recommend several paths. Now your job is to recommend two paths to your user: one is the shortest, and the other is the fastest. It is g...
2020-04-19 15:32:48
135
原创 1110 Complete Binary Tree
Given a tree, you are supposed to tell if it is a complete binary tree.Input Specification:Each input file contains one test case. For each case, the first line gives a positive integer N (≤20) whic...
2020-04-18 17:47:02
150
原创 1109 Group Photo
Formation is very important when taking a group photo. Given the rules of forming K rows with N people as the following:The number of people in each row must be N/K (round down to the nearest intege...
2020-04-18 16:09:13
224
原创 1108 Finding Average
The basic task is simple: given N real numbers, you are supposed to calculate their average. But what makes it complicated is that some of the input numbers might not be legal. A legal input is a real...
2020-04-18 15:55:18
102
原创 1107 Social Clusters（并查集）
When register on a social network, you are always asked to specify your hobbies in order to find some potential friends with the same hobbies. A social cluster is a set of people who have some of thei...
2020-04-18 15:44:57
197
原创 1106 Lowest Price in Supply Chain（DFS）
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 product from supplier to customer.Starting from one root supplier, everyone on the...
2020-04-16 14:52:21
117
原创 1105 Spiral Matrix
This time your job is to fill a sequence of N positive integers into a spiral matrix in non-increasing order. A spiral matrix is filled in from the first element at the upper-left corner, then move in...
2020-04-16 14:14:22
119
原创 1104 Sum of Number Segments
Given a sequence of positive numbers, a segment is defined to be a consecutive subsequence. For example, given the sequence { 0.1, 0.2, 0.3, 0.4 }, we have 10 segments: (0.1) (0.1, 0.2) (0.1, 0.2, 0.3...
2020-04-16 12:59:55
196
原创 1103 Integer Factorization（DFS）
The K−P factorization of a positive integer N is to write N as the sum of the P-th power of K positive integers. You are supposed to write a program to find the K−P factorization of N for any positive...
2020-04-16 11:43:58
150
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