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183 lines
7.5 KiB
Markdown
183 lines
7.5 KiB
Markdown
## Basic things for Motivation/ First Essential talk
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**Importance of Small Difference**
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- Example 1 :
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- Ask about Breaking Bad
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- discuss the importance of extra 3% clear crystals that walter white made
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- Example 2 :
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- show Pictures of fastest man in India , Asia , World
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- discuss the impact of small millisec difference in timings
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- Depict it with the equation - ``` (1.01)^365 = 37.78 ```
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**Qualities Essential to be the Best**
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- Ask about some essential qualities needed
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- Discuss the importance of few -
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- Consistency
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- Persistance
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- Hardwork in right direction
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- The will power
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**Performace Equation**
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- Discuss about the Performace Equation - ``` Performance = Potential - interference ```
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- why the potential should be increased and interference should be decreased
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- How can the performance be enhanced
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- Attend All Classes
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- Be Mindful
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- **Learning is important**
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## Many technologies, Where to start from?
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- discuss about multiple technologies available , maybe ask students about some names
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- frontend - js,react , angular , vue etc
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- backend - java , python , ruby etc
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- Machine Learning
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- introduce Data structures and Algorithms
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- define and differentiate
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- Data Structure - Something we need to organise data / keep data / Store data
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= Algorithms - the process / the steps
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- give an example of toothbrush being placed in kitchen
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- discuss about the importance of Data structures and Algorithms
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- Eventually reach to the conclusion that Data structure and Algorithms are important
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## Building a site more important than learning about Data Structures and Algorithms ?**
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- Ask the question and then discuss the result with examples
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- Example 1 : **E-Commerce**
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- Dicuss the flow from searching a product to buying it
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- Discuss why we need Data structures and Algorithms in following functionalities
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- Searching a Product - need to be fast
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- Sorting - basis of price , category , reviews etc
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- Search typeahead - throw the name of **trie** just to introduce a wow-factor
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- Concurrency problem - 1 product , 2 buyers
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- Eventually convince that DSA is more important than just building a site
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- Example 2 : **Food Delivery**
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- Finding nearest restaurant
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- Sorting the list of restaurant - basis of name , reviews , location
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- **Utilisation of resources** (Explain with the help of diagram)
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- Shortest path of delivery
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- Shortest time is another factor to consider
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- more factors which finally helps in better utilisation of resources
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- Ask if it's now clear that DSA is the basic building block
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## How Problem Solving works?
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- Dicuss about the computer and decision making
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- How the computer doesn't have mind of its own
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- How every step needed to be told to computer based on several decisions
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- Example 1 : **ATM Machine**
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- Discuss the process outline
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- Discuss the process in detail using decision tree (Don't introduce the name yet)
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- after drawing a basic decision tree - introduce with the name "Decision Tree"
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- Keep on focusing on the importance of decisions in problem solving
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- Example 2 : **Super Mario**
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- Engage students by asking about the game
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- Discuss what decision making happend when you press ```->``` arrow
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- Example 3 : **Pubg Game**
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- Engage students by asking about the game
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- Discuss what decision making happens while a person shoots in pubg
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- How does energy/health reduction happens , what are different variables involved to make one decision
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- Aim
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- Distance
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- Type of Gun
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- Body Armor
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## "Observation" - The key to solve Problems
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- Discuss about Guass
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- Ask students if they know about him, what they know
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- state the problem - tell them his teacher gave him the problem
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- Problem : Find the sum of numbers from 1 -> 100
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- discuss that He didn't jump on problem directly, **made observation** (focus on observation)
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- **Prime Numbers**
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- What are prime Numbers
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- why 1 and 0 are not prime
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- Given a number check if it's prime or not - ask students for the solution
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- Approach 1 : Iterate from 1 -> N and check if it is divisble or not
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- Approach 2 : Sqaure root approach - traverse only till square root
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- Intution - factors always occurs in pairs - focus on presenting it as an observation
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- give proof by examples
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- Time analysis between O(N) and O(squareRoot(N))
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- Considering one % (mod operation - ask if they know) takes 1 msec
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N | Approach 1 - N steps | Approach 2 - sqaureRoot(N) steps
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-- | -------------------- | --------------------------------
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11 | 11 msec | 3 msec
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101 | 101 msec | 10 msec
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100000 | 16.6 min | 1 sec
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10^18 | 116 days | 1.66 min
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- Ask them if they appreciate the improvement in timings - put more focus
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- **Find sqaure root of a given Number**
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- Explain the problem - have to find the integer part
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- Approach - 1 :
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- iterate i from 1 to N and check if square of i is <= N
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- if square <= N - it is current ans
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- else stop the process - **WHY?** - Explain
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- Ask if the Approach 1 is fast enough to increase the curiosity
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- Approach - 2 :
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- start by stating an observation
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- pick some random element and check if it's square is <= or > than N
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- based on previous checks decide to ignore one part - properly explain this with example
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- now rather than picking random , pick middle element
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- reason for picking middle element - it always removes atleast half of the prospect solution
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- Discuss the time Analysis
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## How Data Structures helps in Problem Solving?
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- Discuss how just the way of organising the data can optimise the solution
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- Give example of toothBrush , how toothbrush stored in kitchen would result in ineffeciency
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- **Dictionary Word Search**
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- Discuss the process of searching a word in dictionary
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- Relation with the sqaure root problem
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- Name of the Algorithm - Binary Search
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- How are we able to apply the Binary Search
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- Order matters (Main situation)
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- Arrangement of Data Matters / Organisation of Data Matters
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- **HC Verma** Example - searching a word in HC verma
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- Why Binary search won't work
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- No particular organisation of data
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- Can sort all the words - But is it effecient ? NO!
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- Discuss Index / Appendix
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- How data is stored in a different way which improves efficency
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word | page nos.
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---- | ---------
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velocity | 100 101 167
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- Data Structure used - **Inverted Index**
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- All search engines use this to optumise the search
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## Conclusion
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- Importance of Observation
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- Importance of Data structures and Algorithms
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- Importance of 3 essential qualities
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- Further work
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