COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 12-2 : Heaps Giulia Alberini, Fall 2020 Slides adapted from Michael Langer’s WHAT ARE WE GOING TO DO IN THIS VIDEO? Heaps HEAPS PRIORITY QUEUE Assume a set of comparable elements or “keys”. Like a queue, but now we have a more general definition of which element […]
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CS 112: Data Structures Sesh Venugopal Heap – Implementation Implementation: Structure for storage of heap items As far as the conceptual structure goes, the heap is a binary tree. Therefore, one would expect that a heap could be implemented using a linked binary tree structure, as we did with BSTs However, the fact that the
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COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 5-1: Arraylist Giulia Alberini, Fall 2020 WHAT ARE WE GOING TO DO IN THIS VIDEO? Arraylist ARRAY LISTS ARRAYS IN JAVA Arrays whose elements have a primitive type int[] myInts = new int[15]; myInts[3] = -732; Arrays whose elements have a reference type Shape[] myShapes
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COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 8-3 : OOD10 Iterable and Iterator Giulia Alberini, Fall 2020 WHAT ARE WE GOING TO DO IN THIS VIDEO? Java interfaces Iterable and Iterator ITERABLE and ITERATOR REMEMBER THE FOR-EACH LOOP? int[] numbers = {1,2,3,4,5}; for(int element: numbers) { System.out.println(element); } The for-each loop (also called enhanced
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CS 112 – Data Structures Sesh Venugopal Sequential Search Average Case return false; } Sesh Venugopal Sequential Search on a list: Array or Linked List // on an array of integers for (int i=0; i < arr.length; i++) { if (target == arr[i]) { return true; // on a linked list, Node has int data
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COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 13-2 : Hashing Giulia Alberini, Fall 2020 Slides adapted from Michael Langer’s WHAT ARE WE GOING TO DO IN THIS VIDEO? Hash Maps RECALL: MAP keys (type K) values (typeV) Each (key, value) pairs is an “entry”. For each key, there is at most one value. ARRAYS OF
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CS 112: Data Structures Sesh Venugopal Quicksort Algorithm – Fine Tuning Fine Tuning Running Time Since quicksort can sort an array in place (without using extra array space, unlike mergesort, which needs extra storage), and the average running time is O(nlogn),it is widely used in practice A core set of fine-tuning techniques have been developed
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CS 112: Data Structures Sesh Venugopal Heap – Operations Heap Structure and Function From the structural point of view, the heap is a special type of binary tree. From the functional point of view, it can be used either as a priority queue, which is a specialization of the regular FIFO queue we studied earlier,
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COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 7-1 : Stacks Giulia Alberini, Fall 2020 Slides adapted from Michael Langer’s WHAT ARE WE GOING TO DO IN THIS VIDEO? Stacks ABSTRACT DATA TYPE (ADT) An ADT is a model for a data type. It defines a data type by its behavior from the user’s perspective
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Lecture 10: Kruskal’s Algorithm CSC 226: Algorithms and Data Structures II Quinton ’s Algorithm • Initialize forest consisting of all nodes • Pick a (non-selected) minimum weight edge and if it connects two different trees of the Copyright By PowCoder代写 加微信 powcoder forest, select it. Otherwise, discard it. • Repeat until all components are connect
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