void TestVector() { vector<studentInfo> students; students.push_back(studentInfo("10021","Zhang san")); students.push_back(studentInfo("10002","Li si")); students.push_back(studentInfo("10021","Wang wu")); students.push_back(studentInfo("10021","Wang liu")); students.push_back(studentInfo("10021","Wu liu")); vector<studentInfo>::iterator it =students.begin(); sort(it,students.end()); outputCont("students sorted",cout,students.begin(),students.end()); students.insert(students.begin()+2,studentInfo("10028","shan chang jiang")); outputCont("添加后"，cout,students.begin,students.end()); students.pop_back(); outputCont("删除最后一个"，cout,students.begin(),students.end()); students.erase(students.begin()); outputCont("删除第一个"，cout,student.begin(),students.end()); } 添加合适的头文件，并改正错误

正确的代码如下所示：

#include <iostream>
#include <vector>
#include <algorithm>
#include "studentInfo.h"

using namespace std;

void outputCont(const string& msg, ostream& os, vector<studentInfo>::iterator beg, vector<studentInfo>::iterator end)
{
    os << msg << endl;
    for (vector<studentInfo>::iterator it = beg; it != end; ++it)
        os << *it << endl;
}

void TestVector() {
    vector<studentInfo> students;
    students.push_back(studentInfo("10021","Zhang san"));
    students.push_back(studentInfo("10002","Li si"));
    students.push_back(studentInfo("10021","Wang wu"));
    students.push_back(studentInfo("10021","Wang liu"));
    students.push_back(studentInfo("10021","Wu liu"));

    vector<studentInfo>::iterator it =students.begin();
    sort(it,students.end());
    outputCont("students sorted",cout,students.begin(),students.end());

    students.insert(students.begin()+2,studentInfo("10028","shan chang jiang"));
    outputCont("添加后",cout,students.begin(),students.end());

    students.pop_back();
    outputCont("删除最后一个",cout,students.begin(),students.end());

    students.erase(students.begin());
    outputCont("删除第一个",cout,students.begin(),students.end());
} 

int main() {
    TestVector();
    return 0;
}

需要添加的头文件包括 `iostream`、`vector`、`algorithm` 和 `studentInfo.h`。其中 `studentInfo.h` 是自己在另外一个文件中定义的一个结构体，需要根据自己的实际情况进行修改。此外，在 `outputCont` 函数中，需要将 `student.begin()` 修改为 `students.begin()`。