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小編給大家分享一下C++中二叉樹如何實(shí)現(xiàn)詞頻分析功能,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
通過二叉樹存單詞,并且對總共的單詞數(shù)量進(jìn)行計數(shù),二叉樹自適應(yīng)的將出現(xiàn)頻率高的單詞往上移動以減少二叉樹的搜索時間。
代碼如下
/***********************genSplay.h***********************/ #ifndef _GENSPLAY_H_ #define _GENSPLAY_H_ #include <iostream> using namespace std; //樹節(jié)點(diǎn) template<class T> class SplayingNode { public: T info; SplayingNode *left, *right, *parent; //節(jié)點(diǎn)指針 SplayingNode(){ left = right = parent = 0; } SplayingNode(const T &el, SplayingNode *l = 0, SplayingNode *r = 0, SplayingNode *p = 0) :info(el), left(l), right(r), parent(p){ } }; //二叉樹 template<class T> class SplayTree { protected: SplayingNode<T> *root; void rotateR(SplayingNode<T> *); //向右旋轉(zhuǎn) void rotateL(SplayingNode<T> *); //向左旋轉(zhuǎn) void continueRotation(SplayingNode<T> *gr, SplayingNode<T> *par, SplayingNode<T> *ch, SplayingNode<T> *desc); //重新定義父節(jié)點(diǎn)指針 void semisplay(SplayingNode<T> *); //更改樹結(jié)構(gòu),將權(quán)值大的向上移動 void inorder(SplayingNode<T> *); //中序遍歷 void virtual visit(SplayingNode<T> *){ } //虛函數(shù) public: SplayTree(){ root = 0; } void inorder(){ inorder(root); } T *search(const T &); void insert(const T &); }; template<class T> void SplayTree<T>::continueRotation(SplayingNode<T> *gr, SplayingNode<T> *par, SplayingNode<T> *ch, SplayingNode<T> *desc) { if(gr != 0){ if(gr->right == ch->parent) gr->right = ch; else gr->left = ch; } else root = ch; if(desc != 0) desc->parent = par; par->parent = ch; ch->parent = gr; } template<class T> void SplayTree<T>::rotateR(SplayingNode<T> *p) { p->parent->left = p->right; p->right = p->parent; continueRotation(p->parent->parent, p->right, p, p->right->left); } template<class T> void SplayTree<T>::rotateL(SplayingNode<T> *p) { p->parent->right = p->left; p->left = p->parent; continueRotation(p->parent->parent, p->left, p, p->left->right); } template<class T> void SplayTree<T>::semisplay(SplayingNode<T> *p) { while(p != root){ if(p->parent->parent == NULL){ if(p->parent->left == p) rotateR(p); else rotateL(p); } else if(p->parent->left == p){ if(p->parent->parent->left == p->parent){ rotateR(p->parent); p = p->parent; } else{ rotateR(p); rotateL(p); } } else{ if(p->parent->parent->right == p->parent){ rotateL(p->parent); p = p->parent; } else{ rotateL(p); rotateR(p); } } if(root == NULL) root = p; } } template<class T> T *SplayTree<T>::search(const T &el) { SplayingNode<T> *p = root; while(p != NULL){ if(p->info == el){ semisplay(p); return &p->info; } else if(el < p->info) p = p->left; else p = p->right; } return 0; } template<class T> void SplayTree<T>::insert(const T &el) { SplayingNode<T> *p = root, *prev = NULL, *newNode; while(p != 0){ prev = p; if(el < p->info) p = p->left; else p = p->right; } if((newNode = new SplayingNode<T>(el, 0, 0, prev)) == 0){ cerr << "no room for new node.\n"; exit(1); } if(root == 0) root = newNode; else if(el < prev->info) prev->left = newNode; else prev->right = newNode; } template<class T> void SplayTree<T>::inorder(SplayingNode<T> *p) { if(p != 0){ inorder(p->left); visit(p); inorder(p->right); } } #endif // _GENSPLAY_H_
/***********************Splay.cpp***********************/ #include <iostream> #include <fstream> #include <cctype> #include <cstring> #include <cstdlib> //exit(0) #include "genSplay.h" using namespace std; //用作計數(shù)對象的類 class Word { private: char *word; int freq; friend class WordSplay; //friend ostream & operator<<(ostream &out, const Word &wd); public: Word(){ freq = 1; } int operator==(const Word &ir) const{ return strcmp(word, ir.word) == 0; } int operator<(const Word &ir) const{ return strcmp(word, ir.word) < 0; } }; class WordSplay : public SplayTree<Word> { private: int differentWords, wordCnt; void visit(SplayingNode<Word> *); public: WordSplay(){ differentWords = wordCnt = 0; } void run(ifstream &, char *); }; void WordSplay::visit(SplayingNode<Word> *p) { differentWords++; wordCnt += p->info.freq; } void WordSplay::run(ifstream &fin, char *filename) { char ch = ' ', i; char s[100]; Word rec; while(!fin.eof()){ while(1){ if(!fin.eof() && !isalpha(ch)) fin.get(ch); else break; } if(fin.eof()) break; for(i = 0; !fin.eof() && isalpha(ch); i++){ s[i] = toupper(ch); fin.get(ch); } s[i] = '\0'; if(!(rec.word = new char[strlen(s) + 1])){ cerr << "no room for new words.\n"; exit(1); } strcpy(rec.word, s); Word *p = search(rec); if(p == 0) insert(rec); else p->freq++; } inorder(); cout << "\n\nFile " << filename << " contains " << wordCnt << " words among which " << differentWords << " are different.\n"; } int main() { char Filename[80]; WordSplay SplayTree; cout << "enter a filename: "; cin >> Filename; ifstream fin(Filename); if(fin.fail()){ cerr << "cannot open " << Filename << endl; return 1; } SplayTree.run(fin, Filename); fin.close(); return 0; }
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