# PDF Data Structures and Algorithms

And so on. After just five or six of these splits, you quickly home in on Bin in a fraction of the time it took you to find Lin. In doing so, you have followed the binary search algorithm.

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Here we look at two of the most useful sorting algorithms: MergeSort and QuickSort. You first have the group of people, which are all huddled together, divide into two. Then you have each of the two groups divide into two again, and so on, until you are dealing entirely with individuals. You then begin to pair the individuals up, and have the taller of the two in each pair stand to the right of the other one.

Pretty soon everyone is organized into these left-right ordered pairs. Next, you start merging the ordered pairs into ordered groups of four; then merging the ordered groups of four into ordered groups of eight; and so on. Finally, you find that you have a complete, height-ordered line of people, just like the one you encountered above.

## Learn Data Structures | Data Structures and Algorithms Course | NIIT

Without knowing it, you have followed the MergeSort algorithm to accomplish your feat. You could use MergeSort, but you hear that QuickSort is generally faster, so you decide to try it. Your first step is to choose a number in the list called the pivot.

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Choosing the right pivot number will make all the difference in how fast your QuickSort performs, and there are ready-made formulas to follow for choosing good pivots. Moving from left to right through our array, our goal is to put any number smaller than the pivot 9 to the left of the separator, and any number greater than or equal to the pivot to the right of the separator.

## Data Structures - Algorithms Basics

We start with the first number in our array: 4. To move it to the left of the separator, we just move the separator up one element:. We do the same with the next number: 2.

But then we get to 13, which is larger than the pivot number 9 and already to the right side of the separator. So we leave it alone. Next we come to 6, which needs to go to the left of the separator. So first, we swap it with 13 to get it into position:. Then we move the separator passed it:.

Next up is 15, which is already to the right of the separator, so we leave it alone.

## CodeChef Certified Data Structure & Algorithms Programme (CCDSAP)

Then we have Same thing. But 7, our last number before reaching the pivot, needs the same kind of help moving as 6 did. So we swap 7 with 13 to get it into position:. Then, once again, we move the separator passed it:. Part 2 is all about trees and graphs. Part 3 is about searching and sorting algorithms.

This is the most comprehensive data structures and algorithms series online. Every example and exercise is picked from popular interview questions asked by Google, Microsoft, Amazon and other big companies.

In this course, I use Java to teach the concepts but you can apply these concepts in any programming language. Our focus is on data structures and algorithms, not programming languages and tools. All you need to take this course are some basic programming skills. If you know variables, loops, and conditional statements, you're good. If you need a quick refresher to get up to speed with Java syntax, you can watch the first part of my Java series. My name is Mosh Hamedani. I'm a software engineer with almost two decades of experience and I've taught over three million people how to code or how to become a professional software engineer through my online courses and YouTube channel.

Mastering data structures and algorithms is essential to getting your dream job. Don't waste your time browsing disconnected tutorials or super long, boring courses. Enroll in the course to get:. Learn to write better and faster code. Enroll in Course. Limited time only! The coupon code you entered is expired or invalid, but the course is still available! So, why are data structures so important these days? What you're going to learn This course is the first of a series.

Most data structure books and courses are too academic and boring. They have too much math and their code looks ugly, old and disgusting!

### Top 50 Algorithms and Coding Interview Questions

This course is fun and easy to follow and shows you how to write beautiful code like a software engineer, not a mathematician. He can observe what operations are being used and how the process is flowing. We design an algorithm to get a solution of a given problem. A problem can be solved in more than one ways. Hence, many solution algorithms can be derived for a given problem. The next step is to analyze those proposed solution algorithms and implement the best suitable solution.

Efficiency of an algorithm can be analyzed at two different stages, before implementation and after implementation. Efficiency of an algorithm is measured by assuming that all other factors, for example, processor speed, are constant and have no effect on the implementation. The selected algorithm is implemented using programming language. This is then executed on target computer machine.

In this analysis, actual statistics like running time and space required, are collected. We shall learn about a priori algorithm analysis. Algorithm analysis deals with the execution or running time of various operations involved. The running time of an operation can be defined as the number of computer instructions executed per operation. Suppose X is an algorithm and n is the size of input data, the time and space used by the algorithm X are the two main factors, which decide the efficiency of X.