dex reverse number

LeetCode # Reverse Number # LeetCode # Reverse Number # I just memorized the word and made a question to play with it ~ Pick a soft persimmon and step on it ~ Haha It's a simple idea, but the fun thing is that I forgot to check whether the processed data conforms to the integer data and returned it. So I can't AC

] b: [] result:[1, 2, 3, 4, 5] Select 5 of the A array When we merge [2, 4, 5] and [1, 3] we can find that when we put the element k of a array into the result array, the elements of the B array that exist in result must be smaller than K. In the original array, the position of the elements in the B array must be after K, that is, k and these elements constitute the inverse pair. So when we put the elements in the a array, we can calculate th

title link : http://acm.hdu.edu.cn/showproblem.php?pid=4911The main problem : Can exchange a maximum of k times, the minimum number of reverse logarithmProblem Solving Ideas :The inverse number theorem, when the inverse logarithm is greater than 0 o'clock, if akSet primitive sequence minimum inverse logarithm =cntSo, the minimum inverse logarithm max (0,cnt-k) to

There are many algorithms for reverse order pairs. Here we will talk about the idea of Reverse Order pairs for line segment trees. Knowledge Point: Line Segment tree, reverse order pair, single point update, CIDR sum Algorithm: the precondition for the line segment tree to calculate the number of

The number of reverse order refers to the example: Array a={2,4,3,5} then One: Violent matchFor the elements in array a, I from 0 to n-1,j from I+1 to N, judging whether each is an inverse number, time complexity O (LgN). It's too simple to write code ...Two: MergeThe merge sort can solve the reverse order

Title Link: https://www.51nod.com/onlineJudge/questionCode.html#!problemId=1019Test instructions: In one arrangement, if the front and back positions of a pair of numbers are opposite the size order, that is, the previous number is greater than the number of subsequent numbers, then they are called an inverse. The total number of

By the definition of the N-order determinant, it is necessary to solve the whole permutation and reverse order number of a sequence first. 1. Full arrangementAny element of M (m≤n) from n different elements, arranged in a certain order, is called an arrangement of extracting m elements from n different elements. All permutations are called when m=n. Algorithm principle 1. Suppose there i

Title: Segment Tree-minimum number of reverse orderDate:2018-10-12 17:19:16Tags Acm Algorithm Brush questionsCategories acm-segment Tree OverviewThis is a simple line-of-tree problem, and, of course, there are many other practices, and even when violence can be,,,The line tree is mainly used to practice a line tree, and this time, I changed a way of writing line-segment trees,Seems

1. Calculate the number of reverse orders using a tree Array Disadvantage: Only integers can be obtained in reverse order. # Include "treearray. H"/* algorithm: returns reverse order pairs from a tree array. When element I is added, the value of a [I] with element I as the benchmark is + 1, from the end of the team to

The number of reverse order, that is, for n different elements, the first rule between the elements have a standard order (for example, n different natural numbers, can be specified from small to large for the standard order), so in any of the n elements of the arrangement, when a two elements of the sequence and the standard sequence is not the same, said there are 1 r