## Introduction to Merkle Tree

Merkle tree also known as hash tree is a data structure used for data verification and synchronization. It is a tree data structure where each… Read More »

Merkle tree also known as hash tree is a data structure used for data verification and synchronization. It is a tree data structure where each… Read More »

Given a string containing lowercase English alphabets. The task is to find the minimum number of characters needed to be removed so that the remaining… Read More »

Given an array A[] of integers. The task is to print all indices of this array such that after removing the ith element from the… Read More »

Given an array of integers and an integer . For every integer of the array a[i], the task is to calculate the count of numbers… Read More »

Given an array with N distinct elements. The task is to find the minimum number of elements to be changed in the array such that,… Read More »

Given an array. The task is to find the length of the longest subsequence in which all elements must have at least one digit in… Read More »

The hash_hmac_algos() function is an inbuilt function in PHP which is used to get the a list of registered hashing algorithms suitable for hash_hmac() function.… Read More »

The hash_equals function() is an inbuilt function in PHP which is used to compares two strings using the same time whether they are equal or… Read More »

The hash_copy() function is an inbuilt function in PHP which is used to get the copy of hashing context. Syntax: hash_copy( $context ) Parameters: This… Read More »

The hash_algos() function is an inbuilt function in PHP which is used to return a list of registered hashing algorithms. Syntax: array hash_algos( void )… Read More »

Given an integer . The task is to find all factors of N and print the product of four factors of N such that: Sum… Read More »

Given two unsorted arrays arr1[] and arr2[]. They may contain duplicates. For each element in arr1[] count elements less than or equal to it in… Read More »

Given two arrays arr1[] and arr2[]. The task is to find the count of such elements in the first array whose at-least one factor is… Read More »

Given a String str containing only lowercase English alphabets and an integer K. The task is to check that whether the string can be converted… Read More »

The SHA-2 family of cryptographic hash functions consists of six hash functions. These are: SHA-224, with 224 bit hash values SHA-256, with 256 bit hash… Read More »