### Interview question - Given an array find four elements such that A + B = C + D

Problem Statement:Given an array A of integers, find the index of values that satisfy A + B = C + D, where A,B,C & D are integers values in the array.Note:1) Return the indices `A1 B1 C1 D1`, so that A[A1] + A[B1] = A[C1] + A[D1] A1

### Multi dimensional array sorting in php

Sorting a multi dimensional array represents a very common and frequent requirement. Let me get straight to a practical example:Here is an array of activities by several users on EduSagar:$activities = array ( '1' => array( 'id

### zero length array in C

Declaring Zero length array in place of normal pointers is a common programming practice in networking jargon where we have to implement header of a payload to be passed across network. In this article, we will discuss how we can implement