结构异常错误

在这个程序中，我需要从文本文件中读取信息，第一行是我正在读取的课程数量，以处理信息，下一行"chunk"是课程名称，最后一行"chunk"列出了特定课程的先决条件。所以，

18 //number of courses to read in
CSC111 //course 1
CSC112 //course 2
etc....
2    6  //course 1 is a prereq for course 2 and 6
7    8    9    11    15  //course 2 is prereq for course 7,8,9,11,15
etc....

我已经找到了将行标记化的方法，我需要将给定课程有多少依赖项的信息放入"course"结构中，其中一个变量是"numDependencies"。我已经声明了一个N+1个课程对象的数组（索引从1开始，而不是0）。因此，课程1的numDepenedencies应该是2，课程2的numDependencies应该为5，依此类推。问题是，一旦我达到课程11，我的numDeperencies变量就会被设置为297796848这样的值，我不知道为什么。这是我的课程结构和主要

typedef struct Course
{
    int numDependencies;
    int numPrerequisites;
    string name;
    int dependencies[6];
} Course;
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
#include <cstdio>
#include "Course.h"
using namespace std; 
int main()
{
    int N;  //Number of courses
    ifstream infile("CSCCourses.txt");
    if (infile.fail()){
        cout << "File not found." << endl;
        //exit(0);
    }
    //read in number of courses
    infile >> N;
    //dynamically allocate array of courses
    Course* courseArray = new Course[N+1];
    //loop N times to read course names
    for (int i = 1; i <= N; i++){
        infile >> courseArray[i].name;
        cout << courseArray[i].name << endl;
    }
    //loop again to read course information
    //string str; //maybe this variable should be declared here?
    for (int j = N; j <= N+12; j++) 
    {
        cout << "Course " << j - N << endl;
        string str;
        getline(infile, str);
        //Skip delimiters
        string::size_type lastPos = str.find_first_not_of(" ", 0);
        //Find first non delimiter
        string::size_type pos = str.find_first_of(" ", lastPos);
        while (string::npos != pos || string::npos != lastPos)
        {
            //Found token, put prereqs in course
            string numAsStr = str.substr(lastPos, pos - lastPos);
            //convert numasstr to integer
            int num = atoi(numAsStr.c_str());
            cout << num << endl;
            //use integer to set values properly in array of courses
            if(num != 0) {
                courseArray[j].numDependencies++;
            }
            lastPos = str.find_first_not_of(" ", pos);
            //find next non delimiter
            pos = str.find_first_of(" ", lastPos);
        }
        int number = courseArray[j].numDependencies;
        cout << "Number of dependencies is " << number << endl;
        cout << "--------------------------" << endl;
    }
infile.close();

}