Given a directed graph and two vertices (say source and destination vertex), determine if the destination vertex is reachable from the source vertex or not. If the path exists from the source vertex to the destination vertex, print it.
Write a program to count number of ways to calculate a target number from elements of specified array by using only addition and subtraction operator. The use of any other operator is forbidden.
Given a M x N rectangular grid, print all shortest routes in the grid that start at the first cell (0,0) and end at the last cell (N-1,M-1). We can move down or right or diagonally (down-right) but not up or left.
In k-partition problem, we need to partition an array of positive integers into k disjoint subsets that all have equal sum and they completely covers the set.
Given a string and a pattern, determine if the pattern matches with the string or not. The solution should not use any regex.
Given a positive integer, find minimum number possible by doing at-most K swap operations upon its digits.
Given a positive number N, find all combinations of 2*N elements such that every element from 1 to N appears exactly twice and distance between its two appearances is exactly equal to value of the element.
In this post, we will see how to find all permutations of a string containing all distinct characters in C++.
Given a binary pattern that contains ‘?’ wildcard character at few positions, find all possible combinations of binary strings that can be formed by replacing the wildcard character by either 0 or 1.
Find the total number of unique paths which the robot can take in a given maze to reach the destination from given source.