C++中单项链表的结点删除问题——为什么我的链表编译能过，但是运行的时候显示：*** Error in `./list': free(): invalid pointer: 0x08ba20cc *** 已放弃 (核心已转储)

  1 #include<iostream>
  2 #include<cstring>
  3 using namespace std;
  4
  5 struct student{
  6     int my_id;
  7     char name[20];
  8     int my_age;
  9     int my_score;
 10     student *next = nullptr;
 11     student() = default;
 12     student(int id,const char *n,int age,int score)
 13         {my_id = id;my_age = age;my_score = score;strcpy(name,n);}
 14     ~student(){}
 15 };
 16 struct stu_list{
 17     stu_list() = default;
 18     ~stu_list(){};
 19     int creat_list();
 20     void show_list();
 21     int add_list(int num,const char *nn,int a,int s);
 22     int remove_list(int nm);
 23     int release_list();
 24 private:
 25     student * head = nullptr;
 26 };
 27 int stu_list::creat_list()
 28 {
 29     student *p = nullptr;
 30     int ret;
 31     while(1)
 32     {
 33         p = new student();
 34        if(!p){perror ("new error");return -1;}
 35        ret=scanf("%d %s %d %d",&p->my_id,p->name,&p->my_age,&p->my_score);
 36        if(ret < 0){break;}
 37        if(head == nullptr){
 38                p->next = nullptr;
 39             head = p;
 40        }else{
 41                p->next = head;
 42             head = p;
 43        }
 44     }//end while(1)
 45     return 0;
 46
 47 }
 48 void stu_list::show_list()
 49 {
 50     student *p = head;
 51     printf("学号\t姓名\t\t年龄\t成绩\n");
 52     while(p)
 53     {
 54         printf("%d\t%s\t%d\t%d\n",p->my_id,p->name,p->my_age,p->my_score);
 55         p = p->next;
 56     }
 57 }
 58 int stu_list::add_list(int num,const char *nn,int a,int s)
 59 {
 60     student *p = nullptr;
 61     p = new student(num,nn,a,s);
 62        if(head == nullptr){
 63                p->next = nullptr;
 64             head = p;
 65        }else{
 66                p->next = head;
 67             head = p;
 68        }
 69     return 0;
 70 }
 71
 72 int stu_list::remove_list(int nm)
 73 {
 74     student *p,*q;
 75    p = head;q = head;
 76     while(p){    //查找要删除的结点
 77     if( p->my_id == nm){break;}
 78     q = p;
 79     p = p->next;
 80     }//end while
 81     if(p != nullptr)
 82     {
 83         if(p == head)
 84             {
 85                 if(p->next == nullptr){
 86                     head = nullptr;
 87                 }else{
 88                     head = head->next;
 89                 }
 90             }
 91         else{
 92             if(p->next == nullptr){q->next = nullptr;}
 93             else{q->next = p->next;}
 94         }
 95         delete [] p;
 96         return 0;
 97     }//end first if
 98     return -1;
 99 }
100 /*
101 int stu_list::release_list()
102 {
103     student *p = head;
104     student *tmp = head;
105     while(p)
106     {
107         tmp = p->next;
108         delete [] p;
109         p = tmp;
110     }
111 }
112 */
113 int main()
114 {
115     stu_list stu;
116     stu.creat_list();
117     stu.show_list();
118     cout<<"==========================================="<<endl;
119     stu.add_list(10006,"niwangba",21,65);
120     stu.show_list();
121     cout<<"==========================================="<<endl;
122     stu.remove_list(10006);
123     stu.show_list();
124
125 //    stu.release_list();
126     return 0;
127 }

为什么我的链表编译的时候能通过，但是运行的时候却显示：*** Error in `./list‘: free(): invalid pointer: 0x08ba20cc *** 已放弃 (核心已转储)？

求解决方法。还有就是这段代码能优化吗?

C++中单项链表的结点删除问题——为什么我的链表编译能过，但是运行的时候显示：*** Error in `./list': free(): invalid pointer: 0x08ba20cc *** 已放弃 (核心已转储)