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Algorithms Articles
Page 26 of 39
How to print maximum number of A’s using given four keys
Let us consider, we will try to write the letter ‘A’, using the keyboard. Our goal is to use only four keys and try to write maximum ‘A’s on the text field. The keys are ‘A’, ‘C’, ‘V’ and ‘Ctrl’.To write the maximum number of A, we will use Ctrl + A to select All, Ctrl + C to copy and Ctrl + V to paste.Input and OutputInput: Number of keystrokes, say 7 Output: Maximum Number of A's with 7 keystrokes is: 9 Press A three times. Then Ctrl+A, Ctrl+C, Ctrl+V, Ctrl+VAlgorithmkeyNumbers(keyStrokes)Input: number of keystrokes.Output: Maximum number of letters using these ...
Read MoreLargest Independent Set Problem
The Independent Set is the subset of all binary tree nodes when there is no edge between any two nodes in that subset. Now from a set of elements, we will find the longest independent set. i.e. If the elements are used to form a binary tree, then all largest subset, where no elements in that subset are connected to each other.Input and OutputInput: A binary tree. Output: Size of the Largest Independent Set is: 5AlgorithmlongSetSize(root)In this algorithm Binary tree will be formed, each node of that tree will hold data and setSize.Input − Root node of the binary tree.Output − ...
Read MoreLargest Sum Contiguous Subarray
An array of integers is given. We have to find the sum of all elements which are contiguous, whose sum is largest, that will be sent as output.Using dynamic programming we will store the maximum sum up to current term. It will help to find the sum for contiguous elements in the array.Input and OutputInput: An array of integers. {-2, -3, 4, -1, -2, 1, 5, -3} Output: Maximum Sum of the Subarray is: 7AlgorithmmaxSum(array, n)Input − The main array, the size of the array.Output − maximum sum.Begin tempMax := array[0] currentMax = tempMax for i := ...
Read MoreLongest Bitonic Subsequence
A sequence is said to be bitonic if it is first increasing and then decreasing. In this problem, an array of all positive integers is given. We have to find a subsequence which is increasing first and then decreasing.To solve this problem, we will define two subsequences, they are the Longest Increasing Subsequence and the Longest Decreasing Subsequence. The LIS array will hold the length of increasing subsequence ending with array[i]. The LDS array will store the length of decreasing subsequence starting from array[i]. Using these two arrays, we can get the length of longest bitonic subsequence.Input and OutputInput: A ...
Read MoreLongest consecutive path from a given starting character
A matrix of different characters is given. Starting from one character we have to find the longest path by traversing all characters which are greater than the current character. The characters are consecutive to each other.To find the longest path, we will use the Depth First Search algorithm. During DFS, some subproblems may arise multiple times. To avoid the computation of that, again and again, we will use a dynamic programming approach.Input and OutputInput: The matrix as shown above. And the starting point. Here the starting point is e. Output: Enter Starting Point (a-i): e Maximum consecutive path: 5AlgorithmfindLongestLen(i, j, ...
Read MoreLongest Increasing Subsequence
Longest Increasing Subsequence is a subsequence where one item is greater than its previous item. Here we will try to find Longest Increasing Subsequence length, from a set of integers.Input and OutputInput: A set of integers. {0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15} Output: The length of longest increasing subsequence. Here it is 6. The subsequence is 0, 2, 6, 9, 13, 15.AlgorithmlongestSubSeq(subarray, n)Input − The sub array and the size of sub array.Output − Longest increasing sub sequence length.Begin define array length of size n initially set 0 ...
Read MoreCollect maximum points in a grid using two traversals
There is a matrix with points in each cell, how to get maximum points from that grid using two traversals.There is some condition to satisfy −The first traversal starts from the top left cell in the grid and should go to the bottom left corner. And in the second traversal starting from top right corner to bottom right cornerFrom one cell we can only move to bottom, bottom left of the current cell and bottom right of the current cells only.If one traversal already gets some points from a cell, In the next traversal no points will be ...
Read MoreCompute sum of digits in all numbers from 1 to n
In this problem, we have to find the sum of digits of all numbers in range 1 to n. For an example the sum of digits of 54 is 5 + 4 = 9, Like this, we have to find all the numbers and their sum of digits.We know that there are 10d - 1 numbers can be generated, whose number of digits is d. To find the sum of all those numbers of digit d, we can use a recursive formula.sum(10d- 1)=sum(10d-1- 1)*10+45*(10d-1)Input and OutputInput: This algorithm takes the upper limit of the range, say it is 20. Output: ...
Read MoreCount number of ways to reach a given score in a game
Let us consider a game, in which a player can get some score with 3, 5 or 10 in each move. A target score is also given. Our task is to find how many possible ways are there to reach that target score with those three points.By the dynamic programming approach, we will create a list of all score from 0 to n, and for each value of 3, 5, 10, we simply update the table.Input and OutputInput: The maximum score to reach using 3, 5 and 10. Let the input is 50. Output: Number of ways to reach using ...
Read MoreCount possible ways to construct buildings
Here n number of sections are given, in each section, there are two sides on the road to constructing buildings. If there is one empty space between two houses are needed, then how many possible ways to construct buildings in the plot.There are four possibilities to construct buildings One side of the road Another side of the road No building can be constructed Both sides of the roadInput and OutputInput: It takes the number of sections to construct buildings. Say the input is 3. Output: Enter Number of sections: 3 Buildings can be constructed in 25 different ways.AlgorithmconstructionWays(n)Input: There are n number of section.Output ...
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