h
/******************************************** CopyRight 2007 北京交通大学 工程名称: CSet 文件名: Set.h 修改日期: 2007-4-30 20:19:59 描述: 定义并实现了集合的封装,子集的输出,全排列的输出 ********************************************/ #include <iostream> using namespace std; template <class T> class CSet { public: CSet(int n); CSet(); CSet(const CSet &C); CSet& operator = (const CSet &C); //拷贝入数据的接口 void InPut(T *ptr,int n); //输出全集接口 void OutPut(); //输出子集接口 void ChildSet(); void OrderSet(); ~CSet(); private: //先序遍历,生成子集 SelectChild(int pos); //输出一个子集 void OutChild(); void SelectOrder(int pos); void OutOrder(); void Swap(int pos1,int pos2); T *m_elem; //存储元素 int m_size; //存储集合大小 int m_nout; //输出个数 bool *m_set; //标记元素是否被选中 }; template <class T> CSet<T>::CSet(int n) :m_set(0) { m_size = n; m_elem = new T[n]; m_set = new bool[n]; cout<<"请输入"<<n<<"个元素:"; for (int i=0;i!=m_size;i++) { cin>>m_elem[i]; } } template <class T> CSet<T>::CSet() :m_elem(0),m_size(0),m_set(0) { } template <class T> CSet<T>::CSet(const CSet &C) { if (m_elem) { delete [] m_elem; } if (m_set) { delete [] m_set; } m_size=C.m_size; m_elem=new T[m_size]; m_set = new bool[m_size]; memcpy(m_elem,C.m_elem,sizeof(T)*m_size); } template <class T> CSet<T>& CSet<T>::operator =(const CSet &C) { if (m_elem) { delete [] m_elem; } if (m_set) { delete [] m_set; } m_size=C.m_size; m_set = new bool[m_size]; m_elem=new T[m_size]; memcpy(m_elem,C.m_elem,sizeof(T)*m_size); return *this; } template <class T> CSet<T>::~CSet() { if (m_elem) { delete [] m_elem; } if (m_set) { delete [] m_set; } } template <class T> void CSet<T>::OutPut() { cout<<"输出所有元素:\n"; for (int i=0;i!=m_size;i++) { cout<<m_elem[i]<<" "; } cout<<endl; } template <class T> CSet<T>::SelectChild(int pos) { if (pos >= m_size) { OutChild(); m_nout++; } else { m_set[pos] = true; SelectChild(pos+1); m_set[pos] = false; SelectChild(pos+1); } } template <class T> void CSet<T>::OutChild() { for (int i=0;i!=m_size;i++) { if (m_set[i]) { cout<<m_elem[i]<<" "; } } cout<<endl; } template <class T> void CSet<T>::ChildSet() { memset(m_set,0,sizeof(bool)*m_size); m_nout = 0; cout<<"输出所有子集:\n"; SelectChild(0); cout<<"共计:"<<m_nout<<"个子集"<<endl; m_nout = 0; } template <class T> void CSet<T>::InPut(T *ptr,int n) { if (m_elem) { delete [] m_elem; } if (m_set) { delete [] m_set; } m_set = new bool[n]; m_size = n; m_elem = new T[n]; memcpy(m_elem,ptr,sizeof(T)*n); } template <class T> void CSet<T>::OrderSet() { m_nout=0; cout<<"输出全排列:\n"; SelectOrder(0); cout<<"共计"<<m_nout<<"种全排列.\n"; m_nout=0; } template <class T> void CSet<T>::Swap(int pos1,int pos2) { T tmp = m_elem[pos1]; m_elem[pos1] = m_elem[pos2]; m_elem[pos2] = tmp; } template <class T> void CSet<T>::SelectOrder(int pos) { if(pos >= m_size) { OutOrder(); ++m_nout; } else { for(int i=pos;i!=m_size;i++) { Swap(pos,i); SelectOrder(pos+1); Swap(pos,i); } } } template <class T> void CSet<T>::OutOrder() { for(int i=0;i!=m_size;i++) { cout<<m_elem[i]<<" "; } cout<<endl; }
main
/******************************************** CopyRight 2007 北京交通大学 工程名称: CSet 文件名: main.cpp 修改日期: 2007-4-30 20:19:52 描述: 测试集合类CSet,输出子集,全排列 ********************************************/ #include "Set.h" #include <iostream> #include <string> using namespace std; int main() { //几种初始化CSet的方法 //1.调用默认构造函数,然后用Input接口输入 //例: /* CSet<int> C; int arr[]={1,2,3,4,5}; C.InPut(arr,sizeof(arr)/sizeof(int)); */ //2.构造时候加参数n,表示集合含有几个元素,顺便完成输入 //例: CSet<int> C(5); //输出全集 C.OutPut(); //输出全排列 C.OrderSet(); //输出子集 C.ChildSet(); return 0; }