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765. 情侣牵手-并查集

N 对情侣坐在连续排列的 2N 个座位上,想要牵到对方的手。 计算最少交换座位的次数,以便每对情侣可以并肩坐在一起。 一次交换可选择任意两人,让他们站起来交换座位。人和座位用0到2N-1的整数表示,情侣们按顺序编号,第一对是(0, 1),第二对是(2, 3),以此类推,最后一对是(2N-2, 2N-1)。这些情侣的初始座位row[i]是由最初始坐在第 i 个座位上的人决定的。示例 1:输入: row = [0, 2, 1, 3]输出: 1解释: 我们只需要交换row[...

2020-07-04 00:31:38

1068 Find More Coins (30分)-01背包 、动态规划(01背包问题还没搞明白,待更新)

Eva loves to collect coins from all over the universe, including some other planets like Mars. One day she visited a universal shopping mall which could accept all kinds of coins as payments. However, there was a special requirement of the payment: for eac

2020-06-30 13:51:18

DP问题汇总

https://zhuanlan.zhihu.com/p/126546914

2020-06-30 13:45:26

1064 Complete Binary Search Tree (30分)-数组,中序遍历

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 the node's key. The right subtree of a node contains only nodes with keys greater th

2020-06-30 00:18:08

1057 Stack (30分)-堆栈、二分排序

Stack is one of the most fundamental data structures, which is based on the principle of Last In First Out (LIFO). The basic operations include Push (inserting an element onto the top position) and Pop (deleting the top element). Now you are supposed to im

2020-06-29 23:37:02

1038 Recover the Smallest Number (30分)-数学分析

Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given { 32, 321, 3214, 0229, 87 }, we can recover many numbers such like 32-321-3214-0229-87 or 0229-32-87-321-3214 with respect to different ord

2020-06-29 00:25:15

1049 Counting Ones (30分)-数学分析

The task is simple: given any positive integerN, you are supposed to count the total number of 1's in the decimal form of the integers from 1 toN. For example, givenNbeing 12, there are five 1's in 1, 10, 11, and 12.Input Specification:Each input f...

2020-06-28 23:26:14

1045 Favorite Color Stripe (30分)-求最长公共子序列

Eva is trying to make her own color stripe out of a given one. She would like to keep only her favorite colors in her favorite order by cutting off those unwanted pieces and sewing the remaining parts together to form her favorite color stripe.It is said

2020-06-28 17:23:05

1034 Head of a Gang (30分)-图的连通集,DFS,STL

One way that the police finds the head of a gang is to check people's phone calls. If there is a phone call betweenAandB, we say thatAandBis related. The weight of a relation is defined to be the total time length of all the phone calls made between...

2020-06-27 19:53:19

1030 Travel Plan (30分)-DFS & dijkstra、最短路径

A traveler's map gives the distances between cities along the highways, together with the cost of each highway. Now you are supposed to write a program to help a traveler to decide the shortest path between his/her starting city and the destination. If suc

2020-06-27 15:51:21

1026 Table Tennis (30分)-模拟队列、坑点分析

A table tennis club has N tables available to the public. The tables are numbered from 1 to N. For any pair of players, if there are some tables open when they arrive, they will be assigned to the available table with the smallest number. If all the tables

2020-06-26 23:43:14

1022 Digital Library (30分)-STL大杂烩

A Digital Library contains millions of books, stored according to their titles, authors, key words of their abstracts, publishers, and published years. Each book is assigned an unique 7-digit number as its ID. Given any query from a reader, you are suppose

2020-06-25 01:17:36

1018 Public Bike Management (30分)-DFS、最短路径

There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over the world. One may rent a bike at any station and return it to any other stations in the city.The Public Bike Management Center (PBMC) keeps mo

2020-06-24 21:47:38

1014 Waiting in Line (30分)-queue、坑点分析

Suppose a bank hasNwindows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. The rules for the customers to wait in line are:The space inside the yellow line in front of each window is enoug..

2020-06-24 16:31:32

1004 Counting Leaves (30分)-map、vector

A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child.Input Specification:Each input file contains one test case. Each case starts with a line containing0<N<100, the number of nod.

2020-06-24 01:28:41

1107 Social Clusters (30分)-并查集

1107Social Clusters(30分)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. Asocial clusteris a set of people who have some of their hobbies in common. You are...

2020-06-24 00:04:20

1131 Subway Map (30分)-DFS,最短路径(待更新)

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 your computer skills! Given the starting position of your u

2020-06-23 19:39:33

1115 Counting Nodes in a BST (30分)-BST插入、求高、遍历

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. The right subtree of a node contains only nodes with key

2020-06-23 00:07:24

1119 Pre- and Post-order Traversals (30分)-前序后序重构树,唯一性判定

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 traversal sequences. However, if only the postorder and

2020-06-22 22:54:30

1127 ZigZagging on a Tree (30分)-zigzagging order, double stack

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 standard routine to print the numbers in level-order. However

2020-06-22 21:12:49

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