贪心加树状数组 给出的数据可能出现两种情况,包括与不包括,但我们从右向左删就能避免这个问题. #include<stdio.h> #include<string.h> #include<iostream> using namespace std; const int maxn=200010; int f[maxn],l[maxn],a[maxn]; long long tree[maxn]; int n; inline int lowbit(int x) { retur…
http://acm.hit.edu.cn/hoj/problem/view?id=2430 Source : mostleg Time limit : 1 sec Memory limit : 64 M Submitted : 804, Accepted : 318 As most of the ACMers, wy's next target is algorithms, too. wy is clever, so he can learn most of the algorithms qu…
As most of the ACMers, wy's next target is algorithms, too. wy is clever, so he can learn most of the algorithms quickly. After a short time, he has learned a lot. One day, mostleg asked him that how many he had learned. That was really a hard proble…
My Tags (Edit) Source : mostleg Time limit : 1 sec Memory limit : 64 M Submitted : 725, Accepted : 286 As most of the ACMers, wy's next target is algorithms, too. wy is clever, so he can learn most of the algorithms quickly. After a short tim…
Counting sort is a linear time sorting algorithm. It is used when all the numbers fall in a fixed range. Then it counts the appearances of each number and simply rewrites the original array. For a nice introduction to counting sort, please refer to I…
题目原文: An inversion in an array a[] is a pair of entries a[i] and a[j] such that i<j but a[i]>a[j]. Given an array, design a linearithmic algorithm to count the number of inversions. 分析: 如果没有性能限制,用插入排序算法可以实现.题目性能被限制在nlogn,又是归并排序的练习题,很显然要实现个归并排序,并在里面计…
Comparison of the different algorithms for Polygon Boolean operations. Michael Leonov 1998 http://www.angusj.com/delphi/clipper.php#screenshots http://www.complex-a5.ru/polyboolean/comp.html http://www.angusj.com/delphi/clipper.php#screenshots Intro…
More important than algorithms(just problems #$!%), the techniques/concepts residing at the base of such algorithms is more important. There are broadly 4 ways in which classification of algorithms can be done. Classification by purpose Each algorith…
http://aggregate.org/MAGIC/ The Aggregate Magic Algorithms There are lots of people and places that create and collect algorithms of all types (here are a few WWW sites). Unfortunately, in building systems hardware and software, we in The Aggregate o…
By X Wang Update History:Web Version latest update: 4/6/2014PDF Version latest update: 1/16/2014 The following are top 10 algorithms related topics for coding interviews. As understanding those concepts requires much more effort, this list below only…
