随笔分类 - PAT
摘要：Given N integers, you are supposed to find the smallest positive integer that is NOT in the given list. Input Specification: Each input file contains
阅读全文
摘要：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) i
阅读全文
摘要：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
阅读全文
摘要：After each PAT, the PAT Center will announce the ranking of institutions based on their students' performances. Now you are asked to generate the rank
阅读全文
摘要：Look-and-say sequence is a sequence of integers as the following: D, D1, D111, D113, D11231, D112213111, ... where D is in [0, 9] except 1. The (n+1)s
阅读全文
摘要：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 g
阅读全文
摘要：Suppose that all the keys in a binary tree are distinct positive integers. Given the preorder and inorder traversal sequences, you are supposed to out
阅读全文
摘要：For a student taking the online course "Data Structures" on China University MOOC (http://www.icourse163.org/), to be qualified for a certificate, he/
阅读全文
摘要：Consider a positive integer N written in standard notation with k+1 digits ai as ak⋯a1a0 with 0 for all i and ak>0. Then N is palindrom
阅读全文
摘要：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
阅读全文
摘要：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
阅读全文
摘要：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
阅读全文
摘要：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 = 1673
阅读全文
摘要：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 su
阅读全文
摘要：Given a syntax tree (binary), you are supposed to output the corresponding infix expression, with parentheses reflecting the precedences of the operat
阅读全文
摘要：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
阅读全文
摘要：The "eight queens puzzle" is the problem of placing eight chess queens on an 8 chessboard so that no two queens threaten each other. Thus, a solution
阅读全文
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
摘要：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
阅读全文
摘要：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
阅读全文
浙公网安备 33010602011771号