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The Fourth Dimension Space

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數學建模之——商人過河問題 算法核心:搜索法

問題描述: 三個商人各帶一個隨從乘船過河,一只小船只能容納2人,由他們自己劃船。三個商人竊聽到隨從們密謀,在河的任意一岸上,只要隨從的人數比商人多,就殺掉商人。但是如何乘船渡河的決策權在商人手中,商人們如何安排渡河計劃確保自身安全?

數學建模課上,老師給我們出了這樣一個問題,要我們編程解決,呵呵,于是,就寫了下面這個程序,這個程序適用于商人數和隨從數都《=1000的情況,并且約定小船的容量為2,此程序可以輸出每一步的決策過程,還外包了界面以滿足上課演示的需要;不過限于老師的要求,就沒有寫成小船容量為任意值的情況,如果有時間的話我會繼續往下寫的(貌似也比較容易的樣子)~
如果程序中有BUG,歡迎反饋給我,QQ:64076241.

//本程序在商人數<=1000,隨從數<=1000時測試通過,其余數據不能保證其正確性.
#include<iostream>
#include 
<windows.h>
#include 
<math.h>
#include 
<stdio.h>
#include 
<algorithm>
#include
<time.h>
#include
<conio.h>
using namespace std;



#define NMAX 1001


struct node
{

    
int x;
    
int y;
}
line[10000001];

struct node2
{
    
int data1;
    
int data2;
    
int prex1;
    
int prey1;
    
int prex2;
    
int prey2;
}
;

node2 a[NMAX][NMAX];

int main ()
{

    
        
int N=15;
        
while(N--)
        
{
            system(
"cls");
            cout
<<endl<<endl<<endl<<endl<<endl<<endl;
            cout
<<"     ☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆"<<endl;
            cout
<<"     ★                                                                  ★"<<endl;
            cout
<<"     ☆                                                                  ☆"<<endl;
            cout
<<"     ★                   歡迎來到商人過河模型演示程序                   ★"<<endl;
            cout
<<"     ☆                                                                  ☆"<<endl;    
            cout
<<"     ★                       制    作:羅偉濤(abilitytao)             ★"<<endl;
            cout
<<"     ☆                       指導老師:許春根(南京理工大學應用數學系) ☆"<<endl;
            cout
<<"     ★                                                                  ★"<<endl;
            cout
<<"     ☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆"<<endl;
            Sleep(
100);
            system(
"cls");
            cout
<<endl<<endl<<endl<<endl<<endl<<endl;
            cout
<<"     ★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★"<<endl;
            cout
<<"     ☆                                                                  ☆"<<endl;
            cout
<<"     ★                                                                  ★"<<endl;
            cout
<<"     ☆                   歡迎來到商人過河模型演示程序                   ☆"<<endl;
            cout
<<"     ★                                                                  ★"<<endl;
            cout
<<"     ☆                       制    作:羅偉濤(abilitytao)             ☆"<<endl;
            cout
<<"     ★                       指導老師:許春根(南京理工大學應用數學系) ★"<<endl;
            cout
<<"     ☆                                                                  ☆"<<endl;
            cout
<<"     ★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★"<<endl;
            Sleep(
100);
        }

        cout
<<"\n\n\n\n                                                   請按任意鍵進入演示程序"<<endl;
        
char any;
        getch();

    
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    int n;
    
int m;
    
int i,j;
    
int flagnum1;
    
int flagnum2;
    
while(1)
    
{    
        printf(
"請輸入商人數:");
        scanf(
"%d",&n);
        printf(
"請輸入隨從數:");
        scanf(
"%d",&m);


        
if(n>1000)
        
{
            printf(
"本程序僅在1000以內保證其正確性,請重新輸入\n");
            
continue;
        }



    


        
for(i=0;i<=n;i++)
        
{

            
for(j=0;j<=m;j++)
            
{
                
if(i==0||i==n)
                
{
                    a[i][j].data1
=1;
                    a[i][j].data2
=1;
                    
continue;
                }

                
if(i>=j&&n-i>=m-j)
                
{
                    a[i][j].data1
=1;
                    a[i][j].data2
=1;
                }

                    
            }

        }

        
////////////////////////////////////////////////////////////////////以上為初始化////////////////////////////////////////////////////////////////////////////////
        int flag;
        
int front=1;
        
int rear=1;
        line[rear].x
=n;
        line[rear].y
=m;
        flag
=1;
        flagnum1
=1;
        flagnum2
=0;
        
while(front<=rear)
        
{
            
if(line[front].x==0&&line[front].y==0)
                
break;
            
if(flag==1)
            
{
                
if(a[line[front].x][line[front].y].data1!=1)
                
{
                    flagnum1
--;
                    
if(flagnum1==0)
                        flag
=2;
                    front
++;
                    
continue;
                }

                
                a[line[front].x][line[front].y].data1
=0;
                flagnum1
--;
                
if(flagnum1==0)
                    flag
=2;
                
if(line[front].x-1>=0&&a[line[front].x-1][line[front].y].data2==1)
                
{
                    rear
++;
                    line[rear].x
=line[front].x-1;
                    line[rear].y
=line[front].y;
                    a[line[rear].x][line[rear].y].prex2
=line[front].x;
                    a[line[rear].x][line[rear].y].prey2
=line[front].y;
                    flagnum2
++;
                }

                
if(line[front].y-1>=0&&a[line[front].x][line[front].y-1].data2==1)
                
{
                    rear
++;
                    line[rear].x
=line[front].x;
                    line[rear].y
=line[front].y-1;
                    a[line[rear].x][line[rear].y].prex2
=line[front].x;
                    a[line[rear].x][line[rear].y].prey2
=line[front].y;
                    flagnum2
++;
                }

                
if(line[front].x-1>=0&&line[front].y-1>=0&&a[line[front].x-1][line[front].y-1].data2==1)
                
{
                    rear
++;
                    line[rear].x
=line[front].x-1;
                    line[rear].y
=line[front].y-1;
                    a[line[rear].x][line[rear].y].prex2
=line[front].x;
                    a[line[rear].x][line[rear].y].prey2
=line[front].y;
                    flagnum2
++;
                }

                
if(line[front].x-2>=0&&a[line[front].x-2][line[front].y].data2==1)
                
{
                    rear
++;
                    line[rear].x
=line[front].x-2;
                    line[rear].y
=line[front].y;
                    a[line[rear].x][line[rear].y].prex2
=line[front].x;
                    a[line[rear].x][line[rear].y].prey2
=line[front].y;
                    flagnum2
++;

                }

                
if(line[front].y-2>=0&&a[line[front].x][line[front].y-2].data2==1)
                
{
                    rear
++;
                    line[rear].x
=line[front].x;
                    line[rear].y
=line[front].y-2;
                    a[line[rear].x][line[rear].y].prex2
=line[front].x;
                    a[line[rear].x][line[rear].y].prey2
=line[front].y;
                    flagnum2
++;
                }

                front
++;
                
continue;
            }

            
else if(flag==2)
            
{
                
if(a[line[front].x][line[front].y].data2!=1)
                
{
                    flagnum2
--;
                    
if(flagnum2==0)
                        flag
=1;
                    front
++;
                    
continue;
                    
                }

                
if(line[front].x==0&&line[front].y==0)
                    
break;
                a[line[front].x][line[front].y].data2
=0;
                flagnum2
--;
                
if(flagnum2==0)
                    flag
=1;
                
if(line[front].x+1<=n&&a[line[front].x+1][line[front].y].data1==1)
                
{

                
                rear
++;
                line[rear].x
=line[front].x+1;
                line[rear].y
=line[front].y;
                a[line[rear].x][line[rear].y].prex1
=line[front].x;
                a[line[rear].x][line[rear].y].prey1
=line[front].y;
                flagnum1
++;
                }

                
if (line[front].y+1<=m&&a[line[front].x][line[front].y+1].data1==1)
                
{
                
                    rear
++;
                    line[rear].x
=line[front].x;
                    line[rear].y
=line[front].y+1;
                    a[line[rear].x][line[rear].y].prex1
=line[front].x;
                    a[line[rear].x][line[rear].y].prey1
=line[front].y;
                    flagnum1
++;
                }

                
if(line[front].x+1<=n&&line[front].y+1<=m&&a[line[front].x+1][line[front].y+1].data1==1)
                
{
                    rear
++;
                    line[rear].x
=line[front].x+1;
                    line[rear].y
=line[front].y+1;
                    a[line[rear].x][line[rear].y].prex1
=line[front].x;
                    a[line[rear].x][line[rear].y].prey1
=line[front].y;
                    flagnum1
++;
                }

                
if(line[front].x+2<=n&&a[line[front].x+2][line[front].y].data1==1)
                
{
                    rear
++;
                    line[rear].x
=line[front].x+2;
                    line[rear].y
=line[front].y;
                    a[line[rear].x][line[rear].y].prex1
=line[front].x;
                    a[line[rear].x][line[rear].y].prey1
=line[front].y;
                    flagnum1
++;
                }

                
if(line[front].y+2<=m&&a[line[front].x][line[front].y+2].data1==1)
                
{

                
                rear
++;
                line[rear].x
=line[front].x;
                line[rear].y
=line[front].y+2;
                a[line[rear].x][line[rear].y].prex1
=line[front].x;
                a[line[rear].x][line[rear].y].prey1
=line[front].y;
                flagnum1
++;
                
                }

                front
++;
                
continue;
            }

            front
++;
        }

        
if(front>rear)
        
{
            cout
<<"沒有可行的方案"<<endl;
            
int choice;
            printf(
"如果您要繼續測試,請輸入1,退出請輸入2:");
            scanf(
"%d",&choice);
            
if(choice==1)
                
continue;
            
else
                
break;
        }

        
int tempx=0;
        
int tempy=0;
        
int markx=0;
        
int marky=0;
        printf(
"初始狀態下,河南岸有%d個商人,%d個隨從\n",n,m);
        
//Sleep(5000);

        
int flagforreturn=1;
        
int step=1;

        
while(1)
        
{
            
            
if (flagforreturn==1)
            
{
                
if(markx==n&&marky==m)
                    
break;
                flagforreturn
=2;
                tempx
=a[markx][marky].prex2;
                tempy
=a[markx][marky].prey2;
                printf(
"第%d步:河南岸有%d個商人,%d個隨從,此時,對岸有%d個商人,%d個隨從(此時船在北岸)\n\n",step,n-tempx,m-tempy,tempx,tempy);
                
///////////////////////////////////////////////////////////////////////////////////正確性檢測/////////////////////////////////////////////////////////////////////////////////////
            /*    if(tempx==0||tempx==n||(tempx>=tempy&&n-tempx>=m-tempy)&&(n-markx+m-marky>n-tempx+m-tempy))
                    cout<<"此步正確"<<endl;
                else
                    cout<<"此步錯誤"<<endl;
*/
//
                ////////////////////////////////////////////////////////////////////////////////////////正確性檢測/////////////////////////////////////////////////////////////////////////////////////
                markx=tempx;
                marky
=tempy;
                step
++;
                
//Sleep(5000);
            }

            
else if(flagforreturn==2)
            
{
                
if(markx==n&&marky==m)
                    
break;
                flagforreturn
=1;
                tempx
=a[markx][marky].prex1;
                tempy
=a[markx][marky].prey1;

                printf(
"第%d步:河南岸有%d個商人,%d個隨從,此時,對岸有%d個商人,%d個隨從(此時船在南岸)\n\n",step,n-tempx,m-tempy,tempx,tempy);

                
////////////////////////////////////////////////////////////////////////////////////////正確性檢測/////////////////////////////////////////////////////////////////////////////////////
                /*    if(tempx==0||tempx==n||(tempx>=tempy&&n-tempx>=m-tempy)&&(n-markx+m-marky<n-tempx+m-tempy))
                    cout<<"此步正確"<<endl;
                else
                    cout<<"此步錯誤"<<endl;
*/

                
////////////////////////////////////////////////////////////////////////////////////////正確性檢測/////////////////////////////////////////////////////////////////////////////////////
                markx=tempx;
                marky
=tempy;
                step
++;
                
//Sleep(5000);
            }

        }

        
int choice;
        printf(
"如果您要繼續測試,請輸入1,退出請輸入2:");
        scanf(
"%d",&choice);
        
if(choice==1)
            
continue;
        
else
            
break;


    }

     N
=20;
    
while(N--)
    
{
        system(
"cls");
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                              謝謝您的使用!再見!                             "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                            ·                                                 "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                      ·                       "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        Sleep(
10);
        system(
"cls");
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                              謝謝您的使用!再見!                             "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                            │                                                 "<<endl;
        cout
<<"                         \    /                                              "<<endl;
        cout
<<"                       ─        ─                   │                       "<<endl;
        cout
<<"                         /    \                  \    /                    "<<endl;
        cout
<<"                            │                   ─        ─                  "<<endl;
        cout
<<"                                                   /    \                    "<<endl;
        cout
<<"                                                      │                       "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        Sleep(
10);
        system(
"cls");
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                              謝謝您的使用!再見!                             "<<endl;         
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                            │                                                 "<<endl;
        cout
<<"                       \        /                                            "<<endl;
        cout
<<"                                                      │                       "<<endl;
        cout
<<"                     ─            ─            \        /                  "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                       /        \            ─            ─                "<<endl;
        cout
<<"                            │                                                 "<<endl;
        cout
<<"                                                 /        \                  "<<endl;
        cout
<<"                                                      │                       "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        Sleep(
10);
        system(
"cls");
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                              謝謝您的使用!再見!                             "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        cout
<<"                                                                               "<<endl;
        Sleep(
10);
    }


system(
"pause");
    
return 0;
}



posted on 2009-02-26 11:07 abilitytao 閱讀(9279) 評論(15)  編輯 收藏 引用

評論

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-02-26 11:59 陳梓瀚(vczh)

這里可以用最短路經法。  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-02-26 12:21 abilitytao

@陳梓瀚(vczh)
恩 開始我也想過的 可是貌似有兩種狀態吧
一種是船在南岸,一種是船在北岸,如果用dij,貌似在這里就卡住了
不知道要怎么改進才能識別這兩種狀態呢?

  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-02-26 15:32 winsty

邊權相等的最短路啊
BFS就可以了  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法[未登錄] 2009-02-26 17:10 abilitytao

@winsty
難道我用的不是BFS?

  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-02-27 13:41 yindf

片尾很帥!  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-05-04 13:06 馬文旭

有沒有C版的呢?
我怎么運行不了呢?  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-05-04 22:25 abilitytao

@馬文旭
VC6.0肯定能運行的  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-05-07 20:58 愛你

四個人的是不是可定能過去啊 ?  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-05-08 01:31 abilitytao

@愛你
如果船的容量是2人的話 無解 ,3個人以上應該是可以的:-)  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-05-22 16:41 shizhanwei

3以上怎么不行?  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法[未登錄] 2009-05-22 17:25 abilitytao

@shizhanwei
因為無解  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2009-10-28 20:06 俠客西風

這個貌似和傳教士過河一樣,我學人工智能的時候,也做過這個搜索算法...  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法[未登錄] 2010-02-09 14:02 abilitytao

現在在一看這個搜索代碼 寫得真是差勁。。。。  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2011-06-10 10:33 hyzdou

什么是搜索發,求指教。  回復  更多評論   

# re: 數學建模之——商人過河問題 算法核心:搜索法 2012-10-07 20:12 abilitytao

@hyzdou
這個代碼寫的很差 請無視吧。。  回復  更多評論   


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