enqureshortestdlg.cpp

用C语言实现序列任意两点之间最短路径的查找算法。

// EnqureShortestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "EnqureShortest.h"
#include "EnqureShortestDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEnqureShortestDlg dialog

CEnqureShortestDlg::CEnqureShortestDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CEnqureShortestDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CEnqureShortestDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CEnqureShortestDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CEnqureShortestDlg)
	DDX_Control(pDX, IDC_Display, m_Display);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEnqureShortestDlg, CDialog)
	//{{AFX_MSG_MAP(CEnqureShortestDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEnqureShortestDlg message handlers

BOOL CEnqureShortestDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CEnqureShortestDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CEnqureShortestDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CEnqureShortestDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}


struct Node{
	CString city;
	int		From;
	void Init(CString c,int f){
		city=c;
		From=f;
		}
};

int FindPos(CString str,CString* City,int begin,int num){//从位置begin开始找与str匹配的串，返回位置值
		int n;
		int nret=-1;
		for(n=begin;n<num;n++){
			if(City[n]==str){
				nret=n;
				break;
			}
		}
		begin=nret+1;
		return nret;
}


void Push(CString city,int From,int &spoint,Node* stack){
	spoint++;
	stack[spoint].Init(city,From);
}


int	IsInStack(CString ArrivCity,Node* stack,int spoint){
	for(int n=0;n<=spoint;n++){
		if(stack[n].city==ArrivCity)
			return 1;
	}
	return 0;
}

void OutPut(Node* stack,int spoint,CString* Way){
	CString str;
	int pos=spoint;
	int n=0;
	while(pos!=-1){
		str=stack[pos].city;
		pos=stack[pos].From;
		Way[n]=str;
		n++;
	}
	return;
}

int  PushToCity(CString city,CString goal,CString* FromCity,CString* ArrivCity,int num,Node* stack,int &spoint,int sbottom,CString* Way){
	int n;
	int pos=sbottom;
	for(n=0;n<num;n++){
		if(FromCity[n]==city){
			if(!IsInStack(ArrivCity[n],stack,spoint))
				Push(ArrivCity[n],pos,spoint,stack);
			if(ArrivCity[n]==goal){
				OutPut(stack,spoint,Way);//////////////
				return 0;
			}
		}
	}
	return 1;
}

int  EnqureShortestWay(CString init,CString goal,CString* FromCity,CString* ArrivCity,int num,CString* Way){
	Node* Stack=new Node[2*num];
	int spoint=0;
	int sbottom=0;
	Stack[0].Init(init,-1);
	int pos1=0;
	int pos2=0;
	while(sbottom<num){
		if(PushToCity(Stack[sbottom].city,goal,FromCity,ArrivCity,num,Stack,spoint,sbottom,Way))
			sbottom++;
		else break;
	}
	if(sbottom==num){
		return 0;
	}
	return 1;
}
void CEnqureShortestDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here
	CString Way[5]={_T("NULL"),_T("NULL"),_T("NULL"),_T("NULL"),_T("NULL")};
	CString FromCity[5]={_T("1"),_T("1"),_T("2"),_T("2"),_T("5")};
	CString ArrivCity[5]={_T("2"),_T("3"),_T("4"),_T("5"),_T("6")};
	if(!EnqureShortestWay(_T("1"),_T("3"),FromCity,ArrivCity,5,Way)){
		m_Display.AddString("No way!");
		return;
	}
	int n=0;
	while(Way[n]!=_T("NULL")){
		n++;
	}
	n=n-1;
	while(n>=0){
		m_Display.AddString(Way[n]);
		n--;
	}
	return;
}