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Articles on Trending Technologies
Technical articles with clear explanations and examples
Count subarrays having total distinct elements same as original array in C++
We are given an array arr[] containing integers. The goal is to count all subarrays of arr[] such that the number of distinct elements in each is the same as the number of distinct elements in the original array. If the original array is [1, 1, 2, 3] then subarrays will be [1, 2, 3] and [1, 1, 2, 3].Total distinct elements in the original array is 3. Total distinct elements in both subarrays is also 3Let us understand with examples.Input − arr[] = {1, 2, 1, 2, 3, 4, 2 };Output − Count of subarrays having total distinct elements ...
Read MoreCount subarrays consisting of only 0's and only 1's in a binary array in C++
We are given an array arr[] containing 0’s and 1’s only. The goal is to count all subarrays of arr[] such that each subarray contains only 0’s or only 1’s not both. If the array is [1, 0, 0] .Subarrays will be for 0’s only [0], [0], [0, 0] and for 1’s only [1].Let us understand with examples.Input − arr[] = { 0, 0, 1, 1, 1, 0 };Output − Subarrays with only 0's are : 4 Subarrays with only 1's are : 6Explanation − Subaarays will be −For all 0’s: [0], [0], [0], [0, 0]. Total 4 ( arr[0], ...
Read MoreCount sub-arrays which have elements less than or equal to X in C++
We are given an array arr[] containing integers and a variable X. The goal is to count all subarrays of arr[] such that each subarray contains only elements that are less than or equal to X. For example if array is [1, 2, 3] and X=2 then subarrays will be [1], [2] and [1, 2]Let us understand with examples.Input − arr[] = { 4, 3, 2, 1, 6 }; X=3Output − Count of sub-arrays which have elements less than or equal to X is − 6Explanation − Subaarays will be −[3], [2], [1], [3, 2], [2, 1], [3, 2, 1]Input ...
Read MoreHow to extract a data frame's column value based on a column value of another data frame in R?
In data analysis, we encounter many problems with a lot of variations among them. One such problem is we have some information in a place that needs to be checked through a different place and these places can be data frames. Therefore, we can to find a data frame’s column value based on a column value of another data frame. In R, we can easily do it with the help of which function.Examplex2
Read MoreCount rows in a matrix that consist of same element in C++
We are given a matrix consisting of integers. The goal is to find the number of rows in the matrix that have all identical elements in it.If there is 5X4 matrix as shown −15131111115323577777The answer would be 2, row 1 (having all 1’s) and row 3 (having all 7’s) contain the same element.Let us understand with examples.Input matrix = [ 1 1 1 1 ] [ 2 3 2 7 ] [ 3 3 3 3 ]Output − Count of rows in a matrix that consist of same element are − 2Explanation − Row 0 contains all 1’s ...
Read MoreHow to find the position of minimum value in a vector that contains integers as strings in R?
If integer vector is read as strings and we want to find the position of the minimum value in that vector then we need to use as.numeric along with the vector to read it as a numeric vector then use which function for finding the position of the minimum value. For example, if we have a vector x that contains first ten integers as strings then to find the position of the minimum we can use which(as.numeric(x)==min(as.numeric(x))).Example1x1
Read MoreCount rotations in sorted and rotated linked list in C++
We are given a linked list. The list is sorted first and then rotated by K number of nodes. The goal is to find the value of K. If we are given below linked list as input which is rotated by K number of nodes −Then original must have been −And we can see K here is 2. Input linked list is a rotation of 2 nodes in the original sorted linked list.Let us understand with examples.Input − List : 5 → 7 → 9 → 1 → 3Output Elements in the linked list are: 5 7 9 1 3Count of ...
Read MoreHow to convert a list into an array in R?
To convert a list into an array then firstly we need to unlist the list elements and then use the array function. For example, if we have a list defined as List then it can be converted into an array using the command array(unlist(List)). Suppose the list contain the elements as shown below −1 2 3 4 5 1 2 3 4 5 1 2 3 4 5If we convert this list into an array then the output will be 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5.Example1List1
Read MoreCount rotations divisible by 4 in C++
We are given a large number. The goal is to count the rotations of num that are divisible by 4.As the rotations can not be done again and again. We will use the divisible by 4 property. If the last two digits are divisible by 4 then the number is divisible by 4. If the number is 1234 then it’s rotations will be 1234, 4123, 3412, 2341 out of which 3412 will be divisible by 4 as the last two digits 12 is divisible by 4.Let us understand with examples.Input − num=15324Output − Count of rotations divisible by 4 are: ...
Read MoreCount rotations divisible by 8 in C++
We are given a large number. The goal is to count the rotations of num that are divisible by 8.As the rotations can not be done again and again. We will use the divisible by 8 property. If the last three digits are divisible by 8then the number is divisible by 8. If the number is 1800 then it’s rotations will be 1800, 0180, 0018, 8001 out of 1800 is divisible by 8.Let us understand with examples.Input − num=15320Output − Count of rotations divisible by 4 are: 1Explanation − Rotations are −15320, 01532, 20153, 32015, 53201 Out of these, only ...
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