kandi X-RAY | codewars Summary
kandi X-RAY | codewars Summary
The UI looks really cool. Besides, when you solves a problem, you're allowed to view the solution of others'. That's a pretty good way to learn actually.
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Top functions reviewed by kandi - BETA
- Parse input expression
- Performs the calculation
- Declare a function definition
- Tokenize an expression
- Checks if the given board is solved
- Check if r is equal to val
- Check if col in b are equal
- Calculate the position of a word
- Count the number of values in c
- Generate a list of n points
- Count the number of neighbors of a point
- Evaluate a string
- Calculate the sum operator
- Find the start time of a sequence
- Merge overlapping intervals
- Solve the linear system
- Perform a DFS iteration
- Fuzz function
- Return the maximum rotation number
- Return all permutations of a list
- Decompose an array into a sequence
- Generate a solution solution
- Find the shortest path between start_node and end_node
- Returns True if the solution is valid
- Validate the game field
- Solve a matrix
codewars Key Features
codewars Examples and Code Snippets
Community Discussions
Trending Discussions on codewars
QUESTION
I am trying out a task from codewars and wanted to write in a functional programming way in javascript. I have some questions regarding my functions and how the code can be written in a better way.
The task itself is to build a calculator function. It will accept an input in the format:
...ANSWER
Answered 2022-Mar-22 at 14:35In this example are functional programs that can evaluate simple arithmetic -- adding, subtracting, multiplying, or dividing two numbers.
Details are commented in example below
Note: prefix any negative number being passed into calc() with an underscore _ instead of a hyphen -
QUESTION
Write a program to print the sum of all the elements of an array of size N where N can be any integer between 1 and 100. (1 \le N \le 100)
Instructions:
You have to take input variable N denoting the number of elements of the array. Then you have to Input the elements of an array in a single line. We have provided the code to get the input for the array elements. You have to write the logic to add the array elements. Print the sum. Sample input Sample output 3 1 2 3 6 Explanation of Sample I/O
N = 3 Array = 1 2 3
1 + 2 + 3 = 6
...ANSWER
Answered 2022-Mar-20 at 06:24map method takes two arguments first one is a lambda method for converting one data type to other data type and second is an iterable on with the first method operation will be performed.
before converting to int type using filter to remove the data like spaces
QUESTION
I’ve solved a C# beginner Kata on Codewars, asking to return a string[] with only 4-character names. I used a list that is filled in an if statement and then converted back to a string and returned.
My question is regarding the best practice solution below, which is presented later.
I understand that the same string[] that comes as an argument is refilled with elements and returned. But how does the program know that each element of the array is called “name”, as it’s never mentioned before?
Does linq know that a variable with a singular name is an element of a plural name group, here “names”?
Thanks for helping out!
...ANSWER
Answered 2022-Feb-15 at 22:15I understand that the same
string[]that comes as an argument is refilled with elements and returned.
No, absolutely not. A new sequence of strings is returned based on the input array. The input array is not modified or changed in any way.
But how does the program know that each element of the array is called “name”, as it’s never mentioned before?
name is a parameter to an anonymous function. The name parameter is a string based on context. This could be x or ASDASDASD or whatever you want, but here we use name since we have, on each call, one "name" from names.
Thus,
namesis an array of strings passed into the function- the
.Wherereturns a newIEnumerablefrom the current array based on a predicate function (e.g. returns true for a match, false to omit) - The predicate
name => name.Length == 4takes a string and returns true if the string is length 4 - The return from the function is the strings from
namesthat are exactly 4 characters in length
QUESTION
Why does it give me
IndexError: list index out of range in line 28 if (cells[y][x] % TOP == 0
?
If i remove if __name__ == '__main__': everything works perfectly.
Count Connectivity Components is a Kata on codewars, if interested.
...ANSWER
Answered 2022-Feb-01 at 07:44After doing some testing, I noticed that the a string is not the same in both cases (With the if __name__ == "__main__" and without it). The problem is that when you use if __name__ == "__main__" you indent the a string once to put it inside the if statement. It might seem like you indented the code block, but you actually put spaces inside the string itself.
With the if __name__ == "__main__":
QUESTION
I have been really stuck on this codewars challenge: https://www.codewars.com/kata/515de9ae9dcfc28eb6000001/train/php. I feel like I am very close, but I am not sure what I am doing wrong at this point. Here is my code so far:
...ANSWER
Answered 2022-Jan-14 at 23:34You might update your function to:
QUESTION
I was solving a CodeWars task and faced a problem.
In it you are given the array of numbers, which length is a multiple of 4, you need to visualise it as a (x1^2 + x2^2) * (x3^2 + x4^2) .... * (xn^2 + xn+1^2).
Calculate the result of this and find 2 numbers, which squares in sum, gives the result of initial sequance.
For example, you are given an array of ( 2, 1, 3, 4):
(2^2 + 1^2) * (3^2 + 4^2) = 125;
2 numbers, which squares in sum will give 125, is 2 and 11 because 4 + 121 = 125;
I wrote the code and it works with most of examples, but when i use big arrays such as
(3, 9, 8, 4, 6, 8, 7, 8, 4, 8, 5, 6, 6, 4, 4, 5) in result i receive (0,0);
I can't get the problem, help me pls and if u can use simplified english cause i am from Russia. Here is my code:
...ANSWER
Answered 2022-Jan-14 at 14:00it seems your error is coming from this line:
QUESTION
The site codewars.com has a task "Sum of intervals". https://www.codewars.com/kata/52b7ed099cdc285c300001cd
The bottom line is to find the sum of the intervals, taking into account the overlap. For example:
...ANSWER
Answered 2022-Jan-14 at 14:39You solution is too slow effectively, as it is related to the range of data, which may be huge.
If n is the number of intervals, here is a O(n logn) solution.
Sort the intervals according to the start of them, and if equal to the end of them
Perform an iterative linear examination of the intervals as follows:
- sum = 0
- current_start = interval[0].first
- current_end = interval[0].second
- Do i = 1 to n-1
- if (interval[i].first > current_end) then
- sum += current_end - current_start
- current_start = interval[i].first
- current_end = interval[i].second
- else
- current_end = max (current_end, interval[i].second)
- if (interval[i].first > current_end) then
- sum += current_end - current_start
QUESTION
I'm writing my first proper project in python outside of CodeWars katas and problem exercises in my book, and it is designed to calculate the total weekly volume per muscle group of an exercise program.
What I have written is a large dictionary called bodypart where key = exercise name (i.e. bench press) and value = primary muscle group (i.e. chest).
The program then asks users to enter an exercise and number of sets with the following code:
...ANSWER
Answered 2022-Jan-07 at 12:27You can use a dictionary to achieve the behavior you want
Here's a small code snippet -
QUESTION
#include
#include
#include
char *disemvowel(const char *str) {
char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U' };
int len = strlen(str), i, j, k = 0, flag;
char *buf = malloc(sizeof(char) * len);
for (i = 0; i < len; i++) {
flag = 1;
for (j = 0; j < 10; j++)
if (str[i] == vowels[j])
flag = 0;
if (flag) {
buf[k] = str[i];
k++;
}
}
buf[k] = '\0';
buf = realloc(buf, strlen(buf));
return buf;
}
ANSWER
Answered 2021-Dec-26 at 16:52... but the issue seems to be caused by the last character of the returned buffer.
At least this problem:
Off by 1
OP's code allocations do not account for space needed by the null character. strlen() reports a string's length, not including the null character. An allocation needs to account for the size of a string, which does include null character.
QUESTION
I'm trying to add a custom method to the String class in JavaScript called toAlternatingCase, it will turn lowercase characters into uppercase and vice versa in the string that is called on, I'm trying to make it like the built-in toUpperCase/toLowerCase methods which don't take any arguments. this is a kata(challenge) on codewars.
...ANSWER
Answered 2021-Dec-16 at 13:25This can be done by utilizing the prototype method to extend the String class. This probably isn't the most efficient way of doing this, but it can be achieved with something like this:
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