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I have applied to couple of startups and most of them are asking to solve programming challenge before they start on the interviewing candidate.
I have submitted couple of the solution and all the time getting rejected in the initial screening.
Now what i think is, they will see my coding style, algorithm and OOD concepts that i have used to solve the problem. Can you guys input more on it as what other details are taken into consideration and how can i improve my coding for getting selected.
By the way, i did all my coding in either Java/Perl.
Nice question, I am a new grad too... One thing I notice: When you do the exercise home, they expect you to use the best algorithm out there. In my opinion code modularity, even on a small function is key. Put lot effort into the code because they are not just judging you, but comparing you against other candidate. The one which seems to have put the more effort wins.
ps: Ask this question on programmers.stackexchange, you will obtain some good inputs there.
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I can't say I'm weak in programming but I can't come up with the logic faster. I can analyse others code and get to know the logic. But I can't do it on my own. How can I improve my programming skills?
Quite a broad question but from my own, 30yr experience I can tell you there is no way around starting to
analyze existing code,
modify some things (play with it until it feels like it's your own code)
see what the changes do
develop your own ideas on how to do things faster/better/more beautiful
implement your ideas
see if it works
go on to more complex tasks
read books (very important, because many things can't just be discovered by trial'n'error)
be very passionate and determined about what you want to become reality
if you want to learn faster, then write more code
One very important item. You should have fun with what you do is always the best guarantee for success
If you fail at these items then I'm afraid you will never succeed with programming. But then maybe it's like any other field of knowledge.
I experience the same difficulties during my learning journey, too. When I complete challenge tasks I create more complex tasks for myself to see what I can do. It takes me to the next levels of solving problems.
Practice, Practice, Practice!
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I'm mainly a selftought I started studying computer science half a year ago.
Before studying, I genneraly just tried to think of an algorithm to do the tasks I needed to be done - with sorting algorithms for example this was quite easy (they might not have been super efficient, but they did good enough). But sometimes I really struggled to come up with algorithms for quite typical problems:
One example for this is triangulation.
The problem is: I didn't know it was called like that. Quite a few hours later I finally found out about delauney triangulation, and all my problems where immediately solved.
Also in computer science I'm learning about a lot of specific algorithms, but my question is:
Is there a way to learn about all these "important" algorithms, maybe by type or something simular? Or is the only good way to keep studying and hope they come my way at some point?
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I'm good at algorithms but not as good as converting real-time problems and learning them throughly to make it as an algorithm. I would like to know if there is any book/paper that teaches or makes you demystify the situation and formulate it as an algorithm. (Its much like training your mental ability to break the situation and comeup with algorithm in a crisp.)
Showing some of the ways to approach these kinda problems. and any easy learning links/material would help me a lot.
Note: I know SO doesnt allow to ask for the opinion or something vague (I dont mind my Q being downgraded). But I am asking some concrete problem and hope can get some nice info from some of the great minds here.
The word that fits better as a direct answer is "experience". There exists no magical formula to convert a real time problem into some algorithms that solve it. As an analogy, there exist no predefined patterns on how to solve a mathematical problem. It is a mind's task to express the solution, based on some fundamental knowledge and on experience that is accumulated though constant learning.
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I came across the declaration in a software best practices guide that algorithm and code shouldn't get mixed up. I'm not sure what is meant by this? As far as I understand, code is the implementation of the algorithm, isn't is? So, what exactly is meant by this statement? and why it is considered as a good practice?
Thank You!
The context in which the author mentioned would be clearer if you had pasted the surrounding lines.
Though what it would mean to me is, an algorithm is just a clear step-by-step logic that you would use to implement. You would leave out the finer implementation details like selection of the right data structure and other implementation details while you write/design the algorithm.
A good explanation can be found here
An algorithm is a series of steps for solving a problem, completing a task or performing a calculation. Algorithms are usually executed by computer programs but the term can also apply to steps in domains such as mathematics for human problem solving.
Code is a series of steps that machines can execute. In many cases, code is composed in a high level language that is then automatically translated into instructions that machines understand.
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This may not be question of programming and people are open to close.
Does anyone has list of questions/problems to solve which helps to improve algorithms skills
may be for interview purpose.
A good option is Project Euler.
In its own description:
Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.
The motivation for starting Project Euler, and its continuation, is to provide a platform for the inquiring mind to delve into unfamiliar areas and learn new concepts in a fun and recreational context.
This seems like a perfect match...
Try TopCoder. They have held hundreds of algorithm competitions. Their archive contains thousands of problems for practice, including editorials describing the solutions. You can also view other people's submitted source code for the problems.
This will certainly sharpen your algorithm and problem solving skills, which should make you better prepared for algorithmic interview questions.
Fizz-Buzz?