Suppose we have a string s, we have to find the number of homogenous substrings of s. The answer may be very large, so return answer modulo 10^9+7. A string is said to be homogenous when all the characters of the string are the same.So, if the input is like ... Read More

Suppose we have a number n, indicates that there are n different courses labeled from 1 to n. We also have an array called relations where relations[i] contains a pair (prevCourse_i, nextCourse_i), representing a prerequisite relationship between the course prevCourse_i and the course nextCourse_i: so course prevCourse_i has to be ... Read More

Suppose, we are given a graph that contains n vertices numbered 0 to n -1. The graph is undirected and each edge has a weight. So given the graph, we have to find out the critical and the pseudo-critical edges in the graphs MST. An edge is called a critical ... Read More

Suppose we have three values a, b and c. We are playing a solitaire game with three piles of stones whose sizes are a, b, and c respectively. Each turn the player selects two different non-empty piles, take one stone from each, and add 1 point to his score. The ... Read More

Suppose we have a string s with only three characters 'a', 'b', and 'c'. We shall apply the following algorithm on the string any number of times −Select a non-empty prefix from the s where all the characters in the prefix are same.Select a non-empty suffix from the s where ... Read More

Suppose we have an array called nums. We have to find the absolute sum of a subarray [nums_l, nums_l+1, ..., nums_r-1, nums_r] is |nums_l + nums_l+1 + ... + nums_r-1 + nums_r|. We have to find the maximum absolute sum of any subarray of nums (that subarray can possibly be ... Read More

Suppose we have a tree with n nodes that are numbered from 0 to n-1. The tree is given by a parent array, where parent[i] is the parent of node i. The root of the tree is node 0. We have to find the kth ancestor of a given node, ... Read More

Suppose we have an array of positive calues candiesCount where candiesCount[i] denotes the number of candies of the ith type we have. We also have another another array called queries where queries[i] has three parameters [favoriteType_i, favoriteDay_i, dailyCap_i]. We have some rules:We start eating candies on day 0.We cannot eat ... Read More

Suppose we have an array called houses and have another value k. Here houses[i] represents the location of the ith house along a street, we have to allocate k mailboxes in the street, and find the minimum total distance between each house and its nearest mailbox.So, if the input is ... Read More

Suppose there is an array of size m, represents m houses in a small city, each house must be painted with one of the n colors (the colors are labeled from 1 to n), And some houses are already painted, so no need to paint again. Those houses which are ... Read More