## Count pairs of parentheses sequences such that parantheses are balanced

Given N bracket sequences, the task is to find the number of pairs of bracket sequences by joining which can be obtained a balanced bracket… Read More »

- Count pairs in an array that hold i+j= arr[i]+arr[j]
- Introduction to Merkle Tree
- Longest Subsequence with at least one common digit in every element
- Sum of elements whose square root is present in the array
- Count pairs of parentheses sequences such that parantheses are balanced
- Minimum deletions from string to reduce it to string with at most 2 unique characters
- Count occurrences of the average of array elements with a given number
- Find all good indices in the given Array
- Minimum array elements to be changed to make it a Lucas Sequence
- PHP | hash_copy() Function
- PHP | hash_hmac_algos() Function
- PHP | hash_equals() Function

Given N bracket sequences, the task is to find the number of pairs of bracket sequences by joining which can be obtained a balanced bracket… Read More »

Given an array of integers arr[], the task is to count all the pairs (arr[i], arr[j]) such that i + j = arr[i] + arr[j]… Read More »

Given an array arr[], the task is to find the sum of all those elements from the given array whose square root is present in… 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 »