#include <iostream>
#include <vector>

using namespace std;

int main()
{
    vector<int> ivec1,ivec2;
    int num1,num2;
    
    cout<<"Enter the first series of numbers:"<<endl;
    while(cin>>num1)
        ivec1.push_back(num1);
        
    cout<<"Enter the second series of numbers:"<<endl;
    while(cin>>num2)
        ivec2.push_back(num2);
        
    vector<int>::iterator it=ivec1.end()<ivec2.end()?ivec1.end():ivec2.end();
    for(vector<int>::iterator it1=ivec1.begin();it1!=it;++it1)
        for(vector<int>::iterator it2=ivec2.begin();it2!=it;++it2)
        {
            if(*it1!=*it2)
                {cout<<"false!"<<endl;
                return -1;
                }
            else{
                 cout<<"ture!"<<endl;
                 if(ivec1.end()<ivec2.end())
                     cout<<"The first numbers are parts of second numbers"<<endl;
                 else if(ivec1.end()==ivec2.end())
                      cout<<"The first numbers are equle to second numbers"<<endl;
                 else
                     cout<<"The second numbers are parts of first numbers"<<endl;
                     
                 return 0;
                 }
        }
} 

程序的要求是输入2组数，少的一组个数为n的话，就比教两组数的前n个是否相同，是就返回true

我按要求写了这么段代码，可是在输完第一组数字后，提示输入第二组数字后，就无法再输入任何内容，过了一段时间，程序会自动结束。实在是找不到是什么问题

cin的状态标志清除下

修改了下 供楼主参考

不要用.end()来比较

#include <iostream>
#include <vector>

using namespace std;

int main()
{
    vector<int> ivec1,ivec2;
    int num1,num2;
    
    cout<<"Enter the first series of numbers:"<<endl;
    while(cin>>num1)
        ivec1.push_back(num1);
    
    cin.clear(); //cin的状态标志清除下
    cout<<"Enter the second series of numbers:"<<endl;
    while(cin>>num2)
        ivec2.push_back(num2);
    

 //   vector<int>::iterator it=ivec1.end()<ivec2.end() ?ivec1.end():ivec2.end();
    vector<int>::iterator it1=ivec1.begin();
    vector<int>::iterator it2=ivec2.begin();
    for( ; it2 != ivec2.end() && it1 != ivec1.end(); ++it1,++it2)
    {
        if(*it1 != *it2)
        {
            cout<<"false!"<<endl;
            return -1;
        }
        else
            continue;
    }

    cout<<"ture!"<<endl;
    if(ivec1.size()<ivec2.size())
        cout<<"The first numbers are parts of second numbers"<<endl;
    else if(ivec1.size()==ivec2.size())
        cout<<"The first numbers are equle to second numbers"<<endl;
    else
        cout<<"The second numbers are parts of first numbers"<<endl;
    
    

    return 0;
} 


    

顶楼上，你比较的只是指针，即地址，它们之和内存分配有关