Found 216 Articles for Analysis of Algorithms

Here we will see the threaded binary tree data structure. We know that the binary tree nodes may have at most two children. But if they have only one children, or no children, the link part in the linked list representation remains null. Using threaded binary tree representation, we can reuse that empty links by making some threads.If one node has some vacant left or right child area, that will be used as thread. There are two types of threaded binary tree. The single threaded tree or fully threaded binary tree. In single threaded mode, there are another two variations. ... Read More

In this section we will see the generalized lists. The generalized list can be defined as below −A generalized list L is a finite sequence of n elements (n ≥ 0). The element ei is either an atom (single element) or another generalized list. The elements ei that are not atoms, they will be sub-list of L. Suppose L is ((A, B, C), ((D, E), F), G). Here L has three elements sub-list (A, B, C), sub-list ((D, E), F), and atom G. Again sub-list ((D, E), F) has two elements one sub-list (D, E) and atom F.In C++, we ... Read More

In this section we will see what is the sparse matrix and how we can represent them in memory. So a matrix will be a sparse matrix if most of the elements of it is 0. Another definition is, a matrix with a maximum of 1/3 non-zero elements (roughly 30% of m x n) is known as sparse matrix.We use matrices in computers memory to do some operations in an efficient way. But if the matrices are sparse in nature, it may help us to do operations efficiently, but it will take larger space in memory. That spaces have no ... Read More

Here we will see the Irregular arrays. Before discussing the irregular arrays, we have to know what are regular arrays. The regular arrays are that kind of arrays, where the number of columns in each row is same. Or in other words, when each row is holding same number of elements, then that is regular arrays. The following representation is a regular array.From the definition of regular array, we can understand what are the irregular arrays. So in irregular arrays, each row may or may not contain same number of elements. This kind of irregular arrays can also be represented ... Read More

In this section we will see another representation of multidimensional arrays. Here we will see the Array of Arrays representation. In this form, we have an array, that is holding the starting addresses of multiple arrays. The representation will be look like this.This is a two-dimensional array x of size [7 x 8]. Each row is represented as a single onedimensional array. The initial array is holding the addresses of these single arrays. They are array of addresses, so we can say that, it is an array of pointers. Each pointer is holding addresses of another arrays.create this kind of ... Read More

As we know the arrays are homogeneous by definition. So we have to put data of same type in an array. But if we want to store data of different type, then what will be the trick? In C like old languages, we can use unions to artificially coalesce the different types into one type. Then we can define an array on this new type. Here the kind of object that an array element actually contains is determined by a tag. Let us see one structure like this −struct Vehicle{    int id;    union {       Bus ... Read More

Sometimes we create array using dynamic memory allocation. If the array is allocated using dynamic memory allocation technique, we can double the size of array by performing some operations.Suppose initial array size was 5.Array01234Element 1Element 2Element 3Element 4Element 5After array doubling, the size is −0123456789Element 1Element 2Element 3Element 4Element 5Element 6Element 7Element 8Element 9Element 10To double the size of array arr of size n, arr[0…n-1]. At first we have to create one new array of size say m. Then copy n elements from arr to the new array. Finally change the value of arr to point to the new array.To ... Read More

Here we will see how to use substitution method to solve recurrence relations. We will take two examples to understand it in better way.Suppose we are using the binary search technique. In this technique, we check whether the element is present at the end or not. If that is present at middle, then the algorithm terminates, otherwise we take either the left and right subarray from the actual array again and again. So in each step the size of the array decreases by n / 2. Suppose the binary search algorithm takes T(n) amount of time to execute. The base ... Read More

During analysis of algorithms, we find some recurrence relations. These recurrence relations are basically using the same function in the expression. In most of the cases for recursive algorithm analysis, and divide and conquer algorithm we get the recurrence relations.Here we will see one example of recurrence equation by the help of some examples. Suppose we are using the binary search technique. In this technique, we check whether the element is present at the end or not. If that is present at middle, then the algorithm terminates, otherwise we take either the left and right subarray from the actual array ... Read More

In algorithm analysis we count the operations and steps. This is basically justified when computer takes more time to perform an operation than they took to fetch the data needed for that operation. Nowadays the cost of performing an operation is significantly lower than the cost of fetching data from memory.The run time of many algorithms is dominated by the number of memory references (number of cache misses) rather than by the number of operations. So, when we will try to desing some algorithms, we have to focus on reducing not only the number of operations but also the number ... Read More