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Programming Articles
Page 1253 of 2547
Count pairs from two linked lists whose product is equal to a given value in C++
We are given with two linked lists and the task is to form the pairs using the integer elements of linked lists such that their product is equal to a given value which is let’s say, k. A linked list is a sequence of data structures, which are connected together via links.Input vector v_1 = {5, 7, 8, 10, 11}, . vector v_2 = {6, 4, 3, 2, 0} , int k = 20Output Count of pairs from two linked lists whose product is equal to a given value k are: 2Explanation The pairs which can be formed using the given linked lists ...
Read MoreCount of elements of an array present in every row of NxM matrix in C++
We are given an array of integer type elements and a matrix or 2-D array of given row and column size and the task is to calculate the count of elements of an array that are present in each row of a matrix.Input int arr = { 2, 4, 6} and int matrix[row][col] = { { 2, 4, 6 }, {3, 4, 6}, {6, 2, 1}}Output Elements of array in row 1 are: 3 Elements of array in row 2 are: 2 Elements of array in row 3 are: 2Explanation we are having array containing 2, 4 and 6 as elements and now ...
Read MoreCount of matrices (of different orders) with given number of elements in C++
We are given the total number of elements and the task is to calculate the total number of matrices with different orders that can be formed with the given data. A matrix has an order mxn where m are the number of rows and n are the number of columns.Input − int numbers = 6Output −Count of matrices of different orders that can be formed with the given number of elements are: 4Explanation − we are given with the total number of elements that a matrix of any order can contain which is 6. So the possible matrix order with ...
Read MoreProgram to solve partially filled Sudoku Grid in C++
Suppose we have a partially filled Sudoku grid and we have to solve this. We know that Sudoku is a 9 × 9 number grid, and the whole grid are also divided into 3 × 3 boxes There are some rules to solve the Sudoku.We have to use digits 1 to 9 for solving this problem.One digit cannot be repeated in one row, one column or in one 3 × 3 box.Using backtracking algorithm, we will try to solve Sudoku problem. When some cell is filled with a digit, it checks whether it is valid or not. When it is ...
Read MoreCount of numbers having only 1 set bit in the range [0, n] in C++
We are given a number and the task is to calculate the count of numbers from the range 0 till the given number let’s say, num having exactly one set bitSet bits in a binary number is represented by 1. Whenever we calculate the binary number of an integer value then it is formed as the combination of 0’s and 1’s. So, the digit 1 is known as set bit in the terms of the computer.Input − int num = 15Output − Count of numbers having only 1 set bit in the range [0, 15] are − 4Explanation − The ...
Read MoreHow to replace numbers with ordinal strings for a survey in an R vector?
The easiest way to replace numbers with ordinal strings is using ifelse function. The ifelse function in R works as ifelse(test_expression, x, y). Here, test_expression must be a logical vector or an object that can be coerced to logical). The return value is a vector with the same length as test_expression.Example1> x1 x1Output[1] 1 1 1 0 1 0 0 1 1 1 0 0 1 0 1 0 0 1 1 0 0 1 1 1 1 0 0 0 0 1 1 1 0 1 1 0 1 [38] 0 1 1 0 0 1 0 1 1 ...
Read MoreCount the number of elements in an array which are divisible by k in C++
We are given with an array of positive integer numbers and an integer variable k. The task is to calculate the count of the number of elements in an array which is divisible by the given value k.Input − int arr[] = {4, 2, 6, 1, 3, 8, 10, 9}, k = 2Output − Count the number of elements in an array which are divisible by 2 are − 5Explanation − we will divide the elements in an array by a value k and check whether the reminder is 0 or not. So, 4 is divisible by 2, 2 is ...
Read MoreHow to find the column number of minimum values in each row for a data frame in R?
To find the column number of minimum values in each row for a data frame, we can use apply function but if we want to return the output in tabular form then matrix function should be used. For example, if we have a data frame df then our problem can be solved by using the code: as.matrix(apply(df, 1, which.min)).ExampleConsider the below data frame:> set.seed(37) > x1 x2 x3 x4 x5 df1 df1Outputx1 x2 x3 x4 x5 1 1 2 4 9 3 2 0 5 8 10 4 3 1 3 8 6 1 4 1 5 5 8 1 ...
Read MoreHow to find the sum of corresponding elements in multiple vectors even if they contain NA's in R?
If we have multiple vectors then the sum of the corresponding elements can be found by using rowSums functions and the vectors can be combined by using cbind so that R can easily read the corresponding elements. But if there are NA values in one or more vectors then we also need to add na.rm=TRUE argument.Exampleset.seed(100) x1
Read MoreHow to find the rank of a matrix in R?
The rank of a matrix is defined as the maximum number of linearly independent vectors in rows or columns. If we have a matrix with dimensions R x C, having R number of rows and C number of columns, and if R is less than C then the rank of the matrix would be R. To find the rank of a matrix in R, we can use rankMatrix function in Matrix package.Loading Matrix package −library(Matrix)ExampleM1
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