# 算法，第一部分經典課程

Algorithms, Part I

## 31 小時

• 英語, 韓語
• 3476

### 課程概況

This course covers the essential information that every serious programmer needs to know about algorithms and data structures, with emphasis on applications and scientific performance analysis of Java implementations. Part I covers elementary data structures, sorting, and searching algorithms. Part II focuses on graph- and string-processing algorithms.

All the features of this course are available for free. It does not offer a certificate upon completion.

Data Structure

Priority Queue

Algorithms

Java Programming

### 課程大綱

Course Introduction
Welcome to Algorithms, Part I.
1 個視頻 （總計 9 分鐘）, 2 個閱讀材料

Union?Find
We illustrate our basic approach to developing and analyzing algorithms by considering the dynamic connectivity problem. We introduce the union?find data type and consider several implementations (quick find, quick union, weighted quick union, and weighted quick union with path compression). Finally, we apply the union?find data type to the percolation problem from physical chemistry.
5 個視頻 （總計 51 分鐘）, 2 個閱讀材料, 2 個測驗

Analysis of Algorithms
The basis of our approach for analyzing the performance of algorithms is the scientific method. We begin by performing computational experiments to measure the running times of our programs. We use these measurements to develop hypotheses about performance. Next, we create mathematical models to explain their behavior. Finally, we consider analyzing the memory usage of our Java programs.
6 個視頻 （總計 66 分鐘）, 1 個閱讀材料, 1 個測驗

Stacks and Queues
We consider two fundamental data types for storing collections of objects: the stack and the queue. We implement each using either a singly-linked list or a resizing array. We introduce two advanced Java features—generics and iterators—that simplify client code. Finally, we consider various applications of stacks and queues ranging from parsing arithmetic expressions to simulating queueing systems.
6 個視頻 （總計 61 分鐘）, 2 個閱讀材料, 2 個測驗

Elementary Sorts
We introduce the sorting problem and Java's Comparable interface. We study two elementary sorting methods (selection sort and insertion sort) and a variation of one of them (shellsort). We also consider two algorithms for uniformly shuffling an array. We conclude with an application of sorting to computing the convex hull via the Graham scan algorithm.
6 個視頻 （總計 63 分鐘）, 1 個閱讀材料, 1 個測驗

Mergesort
We study the mergesort algorithm and show that it guarantees to sort any array of n items with at most n lg n compares. We also consider a nonrecursive, bottom-up version. We prove that any compare-based sorting algorithm must make at least n lg n compares in the worst case. We discuss using different orderings for the objects that we are sorting and the related concept of stability.
5 個視頻 （總計 49 分鐘）, 2 個閱讀材料, 2 個測驗

Quicksort
We introduce and implement the randomized quicksort algorithm and analyze its performance. We also consider randomized quickselect, a quicksort variant which finds the kth smallest item in linear time. Finally, we consider 3-way quicksort, a variant of quicksort that works especially well in the presence of duplicate keys.
4 個視頻 （總計 50 分鐘）, 1 個閱讀材料, 1 個測驗

Priority Queues
We introduce the priority queue data type and an efficient implementation using the binary heap data structure. This implementation also leads to an efficient sorting algorithm known as heapsort. We conclude with an applications of priority queues where we simulate the motion of n particles subject to the laws of elastic collision.
4 個視頻 （總計 74 分鐘）, 2 個閱讀材料, 2 個測驗

Elementary Symbol Tables
We define an API for symbol tables (also known as associative arrays, maps, or dictionaries) and describe two elementary implementations using a sorted array (binary search) and an unordered list (sequential search). When the keys are Comparable, we define an extended API that includes the additional methods min, max floor, ceiling, rank, and select. To develop an efficient implementation of this API, we study the binary search tree data structure and analyze its performance.
6 個視頻 （總計 77 分鐘）, 1 個閱讀材料, 1 個測驗

Balanced Search Trees
In this lecture, our goal is to develop a symbol table with guaranteed logarithmic performance for search and insert (and many other operations). We begin with 2?3 trees, which are easy to analyze but hard to implement. Next, we consider red?black binary search trees, which we view as a novel way to implement 2?3 trees as binary search trees. Finally, we introduce B-trees, a generalization of 2?3 trees that are widely used to implement file systems.
3 個視頻 （總計 63 分鐘）, 2 個閱讀材料, 1 個測驗

Geometric Applications of BSTs
We start with 1d and 2d range searching, where the goal is to find all points in a given 1d or 2d interval. To accomplish this, we consider kd-trees, a natural generalization of BSTs when the keys are points in the plane (or higher dimensions). We also consider intersection problems, where the goal is to find all intersections among a set of line segments or rectangles.
5 個視頻 （總計 66 分鐘）, 1 個閱讀材料, 1 個測驗

Hash Tables
We begin by describing the desirable properties of hash function and how to implement them in Java, including a fundamental tenet known as the uniform hashing assumption that underlies the potential success of a hashing application. Then, we consider two strategies for implementing hash tables—separate chaining and linear probing. Both strategies yield constant-time performance for search and insert under the uniform hashing assumption.
4 個視頻 （總計 50 分鐘）, 2 個閱讀材料, 1 個測驗

Symbol Table Applications
We consider various applications of symbol tables including sets, dictionary clients, indexing clients, and sparse vectors.
4 個視頻 （總計 26 分鐘）, 1 個閱讀材料

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