Algorithms. Basic course
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This presentation describes an algorithm concept, its main properties, algorithm types, ways to describe an algorithm, and Big O Notation.
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We connect Students who have an understanding of course material with Students who need help.
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Our Vision & Mission – Simplifying Students Life
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ISS Art. How to do IT. Kotlin Multiplatform
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ISS Art CTO describes the technical part of developing a Computer Vision script for neuropharmacology at HappyDevLite conference http://happydevlite.1der.link/site.
You will know about the script we wrote for the company that creates drugs for diseases related to the death of nerve cells.
Well-known examples of these diseases are Parkinson and Alzheimer.
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-how to identify an object that move a bit
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Вебинар "Управление удаленной командой разработчиков"
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Контроль над распределенной командойISS Art, LLC Презентация доклада Максима Дроздова, менеджера проектов компании "ИСС Арт" "Контроль над распределенной командой".
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Algorithms. Basic course
- 3. Informal definition: a set of rules that precisely defines a sequence of operations to accomplish a certain goal. We create, follow and control the execution of algorithms in our everyday life.
- 5. Main properties of an algorithm: Flexibility - an algorithm should be adaptable to solve a wide scope of problems. Discreteness - the process should be divided into separate, well-described steps. One step at a time. Determinacy - the order of the steps of the algorithm and all actions inside each step must be unambiguous. Productivity - at the end of its execution, the algorithm must produce some result. Stability - if an algorithm has correct input parameters, it must always produce the correct results.
- 6. Algorithm types Randomized (stochastic) algorithm such algorithms make some choices randomly (or pseudo-randomly). This can be very useful in finding approximate solutions to problems when finding exact solutions can be impractical (Monte Carlo, Las Vegas algorithms). Heuristic algorithm can be used to find a solution close to the optimal solution in cases when finding the optimal solution is impractical. These algorithms work by getting closer and closer to the optimal solution as they progress. In principle, if run for an infinite period of time, they will find the optimal solution. Their advantage is that they can find a solution very close to the optimal solution in a relatively short time. Linear algorithm is a set of steps executed strictly one after another. Branching algorithm uses at least one ‘if’-condition to make a decision in which of the two (or more) possible path programs its execution should be continued. Iterative algorithms use repetitive constructs like loops and sometimes additional data structures like stacks to solve the given problems. Recursive algorithm is one that invokes (makes reference to) itself repeatedly until a certain condition (also known as termination condition) is met, which is a method common to functional programming.
- 7. Ways to describe an algorithm: Verbal - an algorithm is verbally described in a human language; Symbolic - an algorithm is written down using any algorithmic language; Graphics - an algorithm is written down using block schemes.
- 8. Method to measure algorithm To measure an algorithm, there is usually big O notation used. In computer science, big O notation is used to classify algorithms according to how their running time or memory space requirements grow as the input size grows.
- 9. Advantages of Big O Notation ● Independent of computer architecture; ● Mostly independent of the interpreter or compiler; ● Easily understandable information.
- 10. Limitations of Big O Notation There are numerous algorithms that are too difficult to analyze mathematically. There may not be sufficient information to calculate the behaviour of the algorithm in an average case. The Big O notation sometimes ignores the important constants. For instance, if a particular algorithm takes O(n3) time to run and another algorithm takes O(100n3) time to run, then both algorithms would have equal time complexity according to the Big O notation. The Big O notation tells us how the algorithm grows with the size of the problem and not the efficiency related to it.
- 11. Additional resources: Books: ● Introduction to Algorithms by Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein ● Algorithm Design by Jon Kleinberg Web resources: ● Algorithms. Course by Kevin Wayne