什么是对子？

可以设置一个栈。用栈记录

想复杂了，看看这个。
#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    int total=0;
    int a[7]={1,2,2,3,3,4,3};
    for(int i=0;i<6;i++)
    {
        for(int j=i+1;j<7;j++)
        {
            if(a[i]==a[j])
            {
                total++;
            }
        }
    }
    cout << "The total is "<< total <<endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}

哦，是我理解错了，再写一个看看：
#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    int total=0;
    int a[7]={1,2,2,3,3,4,3};
    int x;
    for(int i=0;i<6;i++)
    {
        for(int j=i+1;j<7;j++)
        {
            if(a[i]>a[j])
            {
                x=a[i];
                a[i]=a[j];
                a[j]=x;            
            }
        }
    }
    for(int i=0;i<7;i++)
    {
        if(a[i]==a[i+1])
        {
            total++;
            i++;
        }
    }
    cout << "The total is "<< total <<endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}

//------------------------------------------------------------------------------------
//   解答:怎么找出一个一维数组中有几个对子？
//        比如说：a[ ] ={1，2，2，3，3，4，2}
//                                                       ---zzy
//                                                       2008.5.30
//-----------------------------------------------------------------------------------
#include <iostream>
#include <vector>
using namespace std;

int main()
{
    cout<<"Please input data of int and finished by any characters:"<<endl;
    
    vector<int> ivec;
    int temp;
    while(cin>>temp)
        ivec.push_back(temp);

    int i=0,count=0;
    int n=ivec.size();
    vector<int>::iterator iter=ivec.begin();
    while(i<n)
    {
        for(int j=i+1;j<n;++j)
        {
            if(iter[j]!=iter[i])
                break;
        }

        if((j-i)>1)
            count+=1;

        i=j;
    }

    cout<<"The number of pair of the vector:"<<count<<endl;
    
    return 0;
}

//------------------------------------------------------------------------------------
//   解答:怎么找出一个一维数组中有几个对子？
//        比如说：a[ ] ={1，2，2，3，3，4，2}
//                                                       ---zzy
//                                                       2008.5.30
//-----------------------------------------------------------------------------------
#include <iostream>
#include <vector>
using namespace std;

int main()
{
    cout<<"Please input data of int and finished by any characters:"<<endl;
    
    vector<int> ivec;
    int temp;
    while(cin>>temp)
        ivec.push_back(temp);

    int i=0,count=0;
    int n=ivec.size();
    vector<int>::iterator iter=ivec.begin();
    while(i<n)
    {
        for(int j=i+1;j<n;++j)
        {
            if(iter[j]!=iter[i])
                break;
        }

        if((j-i)>1)
            count+=int((j-i)/2);

        i=j;
    }

    cout<<"The number of pair of the vector:"<<count<<endl;
    
    return 0;
}