Problem-Solving | coding interview practice problems , data structures | Learning library
kandi X-RAY | Problem-Solving Summary
kandi X-RAY | Problem-Solving Summary
contains all coding interview practice problems, data structures and algorithms implementations.
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Top functions reviewed by kandi - BETA
- Returns the test case
- Return the number of days between two dates
- Return True if two dates are before the given month
- Returns the next day of a month
- Check if parant is balanced
- Pop the item off the stack
- Check if a word is possible
- Find all permutations of a string
- Recursive search for an element in the list
- Calculates the number of coins between target and target
- Sort lst
- Merges two lists
- Return the largest continuous sum in lst
- Return the pointer to the last node after n_before
- Calculate number of coins from target to target
- Check if all elements in lst are in lst
- Binary search
- Check two numbers
- Search lst by item
- Gets the next day of a month
- Find the smallest positive number in_list
- Perform a permutation
- Calculate the number of coins based on the target
- Reverse a list
- Split a phrase into words
Problem-Solving Key Features
Problem-Solving Examples and Code Snippets
Community Discussions
Trending Discussions on Problem-Solving
QUESTION
update:
Turned out it's caused by different classes of variables.
Many thanks to @r2evans, who solved this issue by converting interger64 to numeric when reading the data. His method is effective, but what's worth studying further is his problem-solving logic.
I deleted the data for confidentiality reasons.
Below is the previous questionI plotted histograms of all numeric clomuns in my data table.
...ANSWER
Answered 2021-Jun-03 at 13:22The problem symptom is that two of your fields are appear invariant. After downloading the full data dt:
QUESTION
please tell me how to make a unique key for v-for For example, if you use the index as a key, then the last element will always be animated. Several elements with the same text can exist at the same time. How can I implement this Math.random is unlikely to be a good problem-solving solution Can I use something like Symbol for a unique id
...ANSWER
Answered 2021-Jun-02 at 18:43If you have only strings you should wrap each message with object. It's more convenient way to use id instead of index in your case.
QUESTION
I need to scrape job postings from Indeed. I managed to scrape the titles and links for each job post, and now am struggling to scrape the full job descriptions of each job posting (I don't want the summary - I want each job post's full job description).
My code looks like this:
...ANSWER
Answered 2021-May-12 at 13:58Your code is almost correct. Just an error on this line of code:
job_data = response.text
Replace it with:
job_data = job_response.text
QUESTION
I'm trying to figure out how to test components that update state using useEffect to make an API call to get data. There are several things I think are important to know before I can talk anymore, and that is the files/packages I'm using.
First, I have a main component called App.tsx, inside App.tsx, inside of useEffect, I make a fetch call to an external API to fetch an array of songs by Queen. I also render out a component using .map to iterate over each song and .filter to filter songs on UI based on text input. I'm using a custom hook. Here is the code I have for that component and its custom hook.
ANSWER
Answered 2021-Apr-08 at 17:16I was able to get a passing test with the updated DOM by changing the initial value from null to a blank Array.
I also changed the resulting testing code to the following.
QUESTION
I am working on my website which will have my CV. So I have an array of objects with hard and soft skills
...ANSWER
Answered 2021-Feb-17 at 14:34You can for example use two computed:
QUESTION
My apologies, I know this type of question already has an answer over here but I couldn't figure out how to use it for my code. I wrote a program for a problem-solving contest that accepts an array and tries to maximize the value of |Ax−Ay|+|Ay−Az|+|Az−Ax| over all triples of pairwise distinct valid indices (x,y,z). The program has the following constraints:
- 1≤t≤5
- 3≤n≤10^5
- |Ai|≤10^9 for each valid i
I am getting the following error when I try to run it - "terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc". All I could figure out from the answered questions was that my code encounters memory allocation problem but I couldn't find where and when it does that? Maybe when it deals with large values? What is causing the error?
...ANSWER
Answered 2021-Feb-08 at 17:32you have to do something like this: I am not getting data via cin I am just specifying the value.
QUESTION
List = [1,2,3]
print(sys.getsizeof(List))
Output : 96
ANSWER
Answered 2021-Jan-25 at 01:55Firstly, sys.getsizeof() returns bytes, not bits. So you would be looking for 3. However, that's not possible, since all Python objects have overhead. As well, lists doesn't actually contain their elements, but pointers to them. Then I'm sure there are a lot of implementation details that further complicate things, but I'm not really qualified to talk about them.
That said, you can get closer with array, which actually does contain its elements.
QUESTION
Background Information: I solved the N-Queens problem with the C# algorithm below, which returns the total number of solutions given the board of size n x n. It works, but I do not understand why this would be O(n!) time complexity, or if it is a different time complexity. I am also unsure of the space used in the recursion stack (but am aware of the extra space used in the boolean jagged array). I cannot seem to wrap my mind around understanding the time and space complexity of such solutions. Having this understanding would be especially useful during technical interviews, for complexity analysis without the ability to run code.
Preliminary Investigation: I have read several SO posts where the author directly asks the community to provide the time and space complexity of their algorithms. Rather than doing the same and asking for the quick and easy answers, I would like to understand how to calculate the time and space complexity of backtracking algorithms so that I can do so moving forward.
I have also read in numerous locations within and outside of SO that generally, recursive backtracking algorithms are O(n!) time complexity since at each of the n iterations, you look at one less item: n, then n - 1, then n - 2, ... 1. However, I have not found any explanation as to why this is the case. I also have not found any explanation for the space complexity of such algorithms.
Question: Can someone please explain the step-by-step problem-solving approach to identify time and space complexities of recursive backtracking algorithms such as these?
...ANSWER
Answered 2021-Jan-07 at 15:51First of all, it's definitely not true that recursive backtracking algorithms are all in O(n!): of course it depends on the algorithm, and it could well be worse. Having said that, the general approach is to write down a recurrence relation for the time complexity T(n), and then try to solve it or at least characterize its asymptotic behaviour.
Are we interested in the worst-case, best-case or average-case? What are the input parameters?
In this example, let us assume we want to analyze the worst-case behaviour, and the relevant input parameter is n in the Solve method.
In recursive algorithms, it is useful (though not always possible) to find a parameter that starts off with the value of the input parameter and then decreases with every recursive call until it reaches the base case.
In this example, we can define k = n - row. So with every recursive call, k is decremented starting from n down to 0.
No we look at the code, strip it down to just the relevant bits and annotate it with complexities.
We can boil your example down to the following:
QUESTION
I'm trying to parse a quoted string. Something like this:
...ANSWER
Answered 2020-Dec-06 at 20:07There are a few different approaches that you can take — which one is best will probably depend on the rest of the structure you're employing.
But first an observation on your current solution and why opening it up to others won't work this way. Consider the string 'value". Should that parse? The structure you laid out actually would match it! That's because each token will match either a single or double quote.
The simplest solution is to make your inner part a non-greedy wildcard:
QUESTION
I am using the following codes in the console of the firefox DevTools to extract book names from https://bookauthority.org/books/best-problem-solving-books
Code 1
...ANSWER
Answered 2020-Sep-23 at 22:46querySelectorAll works just fine. The problem resides in that the specific webpage on which you're executing the code, has overriden the window.console.log method and the new implementation apparently does not print arguments to the console, as its native implementation does.
You can see this by issuing window.console.log (without parentheses), which usualy prints something like ƒ log() { [native code] } (at least in Chrome).
There are hacks how to acquire the native implementation. See, for example, this post: https://stackoverflow.com/a/11129588/4005175
Example:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install Problem-Solving
You can use Problem-Solving like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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