Problem Description In the modern time, Search engine came into the life of everybody like Google, Baidu, etc. Wiskey also wants to bring this feature to his image retrieval system. Every image have a long description, when users type some keywords t…

Problem Description In the modern time, Search engine came into the life of everybody like Google, Baidu, etc. Wiskey also wants to bring this feature to his image retrieval system. Every image have a long description, when users type some keywords t…

http://acm.hust.edu.cn/vjudge/problem/16403 题意:给定n个单词,一个字符串,问字符串中出现了多少个单词.(若单词her,he,字符串aher中出现了两个单词) 题解: 每个单词末尾节点sum=1:find的时候每个点都顺着fail往上跳,加上该节点的sum,然后将这个sum清了:注意同一个单词出现多次只算一次. #include<cstdio> #include<cstdlib> #include<cstring> #incl…

#include<iostream> #include<cstring> using namespace std; struct node { int num; node *next[26]; }*root; void join(const char *s) { node *p=root,*t; int i,len=strlen(s); for(i=0;i<len;i++) if(p->next[s[i]-'a']) p=p->next[s[i]-'a']; el…

题目链接:pid=2222">点击进入 KMP对模式串进行处理.然后就能够方便的推断模式串是否在目标串中出现了:这显示适合一个模式串多个目标串的情况.可是假设模式串有多个,这时假设还用KMP则须要对每一个串都进行一次处理,显然不是非常合适.事实上这时候能够将全部模式串建成一棵trie树.然后採用相似于kmp的方法计算出failed指针,也就能够方便的进行匹配了.事实上这就是ac自己主动机的思想. 代码例如以下: #include<iostream> #include<cs…

http://blog.csdn.net/niushuai666/article/details/7002823 #include <iostream> #include <cstdio> #include <cstring> using namespace std; struct node{ int count; node *next[26],*fail; void Node(){ count = 0;fail = NULL; memset(next,NULL,siz…

二叉树(Binary Tree)是最简单的树形数据结构,然而却十分精妙.其衍生出各种算法,以致于占据了数据结构的半壁江山.STL中大名顶顶的关联容器--集合(set).映射(map)便是使用二叉树实现.由于篇幅有限,此处仅作一般介绍(如果想要完全了解二叉树以及其衍生出的各种算法,恐怕要写8~10篇). 1)二叉树(Binary Tree) 顾名思义,就是一个节点分出两个节点,称其为左右子节点:每个子节点又可以分出两个子节点,这样递归分叉,其形状很像一颗倒着的树.二叉树限制了每个节点最多有两个子节…

题目链接:Recover Binary Search Tree | LeetCode OJ Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its structure. Note: A solution using O(n) space is pretty straight forward. Could you devise a constan…

题目链接:Validate Binary Search Tree | LeetCode OJ Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key. The right…

http://www.hightopo.com/demo/astar/astar.html 最近搞个游戏遇到最短路径的常规游戏问题,一时起兴基于HT for Web写了个A*算法的WebGL 3D呈现,算法基于开源 https://github.com/bgrins/javascript-astar 的javascript实现,其实作者也有个不错的2D例子实现 http://www.briangrinstead.com/files/astar/ ,只不过觉得所有A*算法的可视化实现都是平面的不够…