디버깅 오류 일어나는 이유가 뭐임

[질문봇(ace8052)]

#include<iostream>

using namespace std;

class sample {

    int* p;

    int size;

public:

    sample(int n)

    {

        size = n;

        p = new int[n];

    }

    void read();

    void write();

    int big();

    ~sample() {}

};

void sample::read()

{

    for (int i = 0; i < this->size; i++)

    {

        cin >> p[i];

    }

}

void sample::write()

{

    for (int i = 0; i < this->size; i++)

    {

        cout << p[i] << "";

    }

    cout << endl;

}

int sample::big()

{

    int max = p[0];

    for (int i = 1; i < this->size; i++)

    {

        if (max < p[i])max = p[i];

    }return max;

}

int main()

{

    sample s(10);

    s.read();

    s.write();

    cout << "가장 큰 수는" << s.big() << endl;

}

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