reverse array algorithm

Problem descriptionSet A[1...N] is an array, if for i a[j], then a[i] and a[j] constitute a pair of reverse order. Given an array, calculates the number of reverse pairs in the array. For example, array a[] = {1, 4, 3, 2}, then {4, 3} {4, 2} {3, 2}

For Web programming, the most important thing is to access and read and write data. There may be many ways to store them, such as strings, arrays, files, and so on. arrays, which can be said to be a more important way of using PHP data. PHP's Array

I have reviewed this question.Merge SortingAt the same time, we understand that merging and sorting in the arrayNumber of reverse ordersIt's also the first time I 've learned this application.Tree Array   Question: A very direct description of the

arrays, which can be said to be a more important way of using PHP data. PHP's Array function is numerous, below is my study summary, takes this to remember, facilitates later to learn. 1. Array definition The definition of an array is defined using

Sword Point 36: Reverse order in an arraytitle: in the array of two numbers, if the previous number is greater than the following number, then the two numbers constitute an inverse pair. Enter an array to find the total number of reverse pairs in

basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Gets the value of the array Array_keys ($arr), gets the key name of the array array_flip ($arr), and the values in the array are exchanged with the key

[Sword refers to Offer learning] [interview question 36: Reverse Order pairs in the array], sword refers to offer Question: two numbers in the array. If the first number is greater than the next number, the two numbers form a reverse order. Enter an

Basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Get the value of an arrayArray_keys ($arr); Gets the key name of the arrayArray_flip ($arr); the values in the array are exchanged with the key names (if

First, the topicIn the array of two digits, if the previous number is greater than the number that follows, then these two numbers form an inverse pair. Enter an array to find the total number of reverse pairs in this array p. and the output of p to

PHP has a lot of functions about arrays to facilitate array manipulation. Defined: Each entity of an array contains two items: key and value, which can be retrieved by a query key. These keys can be numeric (numerical) or associated (associative)