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Page 1285 of 2109
Working with Array and Vectors using STL in C++
Array and vectors are very important data structures in competitive programming for solving problems. And the STL (Standard Template Library) in c++ programming provide some functions to perform operations of arrays and vectors.Let’s see some of these functions in action, Finding sum, Min and Max of the array/vector − In STL there are function that helps you to find the sum, max, and min of the array/vector. Functions with there function, Finding sumaccumulate(startIndex, endIndex, initialSum)Greatest element of the array/vecto*max_element(startIndex, endIndex)Smallest element of array/vector*min_element(startIndex, endIndex)Program to perform operations on array −Example#include using namespace std; int main(){ int array[] = ...
Read MoreWord Ladder (Length of shortest chain to reach a target word) in C++
In this problem, we are given a dictionary and two words ‘start’ and ‘target’. Our task is to generate a chain (ladder) from start work to target word, the chain is created such that each word differs the other character by only one word and the word should also exist in the dictionary. The target word exists in the dictionary and also the length of all words is the same. The program will return the length of the shortest path from start to target.Let’s take an example to understand the problem, InputDictionary = {‘HEAL’, ‘HATE’, ‘HEAT’, ‘TEAT’, ‘THAT’, ‘WHAT’ , ...
Read MoreWays to select one or more pairs from two different sets in C++
In this problem, we are given two positive numbers n and m (n > 1; x = (1LL * x * x) % p; } return res; } void calculate(int n){ fact[0] = inverseMod[0] = 1; for (int i = 1; i
Read MoreWord formation using concatenation of two dictionary words in C++
In this problem, we are given a dictionary and a word. Our task is to check if the given wors can be formed using the concatenation of two dictionary words.While forming given words repetition of words is not legal.Let’s take an example to understand the problem, Inputdictionary = {“hello”, “tutorials”, “program” , “problem”, “coding”, “point”} word = “tutorialspoint”OutputyesExplanationtutorialspoint is created using tutorials and point.To solve this problem, we will store all elements of the dictionary in a prefix tree commonly known as a trie. And then search for the prefix of the word in the trie, if found split it ...
Read MoreWays to remove one element from a binary string so that XOR becomes zero in C++
In this problem, we are given a binary string. Our task is to count the total number of ways in which we can remove one element such that XOR becomes zero.Let’s take an example to understand the problem, Inputn = 11010Output3to solve this problem, we need the logic that if the number of 1’s is even then XOR of the string will be 0, otherwise, we need to remove one 1 from the string. We can remove any number of 0’s without affecting the XOR.Program to show the implementation of our solution, Example#include #include using namespace std; int wayXorZero(string binaryString){ ...
Read MoreWays to place items in n^2 positions such that no row/column contains more than one in C++
In this problem, we are given an integer n such that there are n lines vertically and n horizontally that are placed such that there are n2 intersection between these lines. Our task is to find the total number of ways by which 4 items can be placed on these intersections insuch a way that no row and column contains more that one item.Let’s take an example to understand the problem, Inputn=4Output24ExplanationTo solve this problem, we will have to choose 4 horizontal lines from n lines that will have items which will be nC4. Now, every horizontal line has n ...
Read MoreWays to paint stairs with two colors such that two adjacent are not yellow in C++
We are given n stairs and 2 colors (red and yellow) with which these stairs are to be painted. Our task is to count the number of ways in which we can paint the stairs such that no two consecutive steps will be yellow-colored.Let’s take an example to understand the problem, Input3Output5ExplanationThe ways in which stairs can be painted are YRY, RYR, YRR, RRY, RRR. here R denotes red color, Y denotes yellow color.To solve this problem, let’s see the number of ways the stairs can be painted.N = 1, ways(1) = 2 : R, YN = 2, ways(2) = ...
Read MoreWays to multiply n elements with an associative operation in C++
In this problem, we are given an integer n which is the number of elements. Our task is to create a program that counts the number of ways to multiply n elements with the associative operation.Associative operations return the same result irrespective of the manner the numbers are arranged.Let’s take an example to understand the problem, Input3Output12Explanation(x*(y*z)), (x*(z*y)), (y*(x*z)), (y*(z*x)), (z*(x*y)), (z*(y*x)), ((x*y)*z), ((y*x)*z), ((x*z)*y), ((z*x)*y), ((z*y)*x), ((y*z)*x).To solve this problem, we will try to find if there is any relation or any type of series that can be created so that we can generalize our results. Let’s see the ...
Read MoreBertrand's Postulate in C++
Bertrand’s postulates is a mathematical showroom which states that for every number n>3, there exists a prime number p which lies between n and 2n-2.The formula for Bertrand's Postulaten < p < 2n -2Where n is a number such that n>3 and p is a prime number.Prime number − A number is a prime number if it's only factors are 1 and itself.A less restrictive formulation of Bertrand’s postulate isn < p < 2n , for all n>1.ExamplesNumber5Output7Explanationprime number in range 5 and 2*5 i.e. prime number between 5 and 10Number11Output13, 17, 19Explanationprime number in range 11 and 2*11 i.e. ...
Read MoreC program for pipe in Linux
Here, we will create a C program for pipe in Linux. In this program, we will read some text from the input stream and then print it to the output screen.First, let’s learn basics about pipe in LinuxPipe is used to transfer data, it can be used for communication between process/ command/ program for transferring standard output between two in Linux or Unix based system.One important thing to be noted is that pipes are unidirectional i.e. data can either flow from left to right or from right to left in the program.Here, we will create a pipe that will read ...
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