## Sum of all natural numbers from L to R ( for large values of L and R )

Given two very large numbers L and R where L ≤ R, the task is to compute the sum of all the natural numbers from… Read More »

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Given two very large numbers L and R where L ≤ R, the task is to compute the sum of all the natural numbers from… Read More »

Introduction to interactive problems in competitive programming is already discussed in the previous article. In this article, another problem based on the same concept is… Read More »

Given an array Arr of N integers representing the nodes of a graph. The edges are defined between those pair whose bitwise AND is not… Read More »

Given a queue. The task is to reverse the queue using another another empty queue. Examples: Input: queue[] = {1, 2, 3, 4, 5} Output:… Read More »

Given a string str consisting of lowercase English alphabets, the task is to find the count of substrings that start with “geeks” and end with… Read More »

Given an array of integers A. The task is to minimise the sum of the elements of the array using the following rule: Choose two… Read More »

Given three integers a, b and N where a and b are the first two terms of the XOR Fibonacci series and the task is… Read More »

In programming it is quite usual for a Java programmer to face time limit exceeded or TLE if they do not use Arrays.sort() function carefully.… Read More »

Given a tree with N nodes. Two players A and B start from node 1 and node N respectively. A can visit all the adjacent… Read More »

Before we discuss this topic in detail we would like to know why you are reading this article. There might be a few reasons and… Read More »

Given a range [L, R], the task is to count the numbers which have even number of odd digits and odd number of even digits.… Read More »

Given an array of unique elements, we have to find all the permutation of length L using the elements of the array. Repetition of elements… Read More »

Given an unbalanced bracket sequence of ‘(‘ and ‘)’, convert it into a balanced sequence by adding the minimum number of ‘(‘ at the beginning… Read More »

Given a tree of distinct nodes N with N-1 edges and a pair of nodes P. The task is to find and print the path… Read More »

Given an array arr[] of size N. The task is to find the sum of the digits of all array elements which contains even number… Read More »