C++这该怎么解决啊，为什么会出现错误


#include
using namespace std;
int main()
{
    int (*a)[3] = new int[3][3];
    int i, j,sum=0,max,min;
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            cin >> *(a+i)[j];
            sum += *(a + i)[j];
        }
    }
    max = *a[0];
    min = *a[0];
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            if (*(a + i)[j] > max)
            {
                max = *(a + i)[j];
            }
        }
    }
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            if (*(a + i)[j] < min)
            {
                min = *(a + i)[j];
            }
        }
    }
    cout << "和为" << sum << endl;
    cout << "最大值为" << max << endl;
    cout << "最小值为" << min << endl;
    delete[]a;
}

img

没有你想象的那么麻烦，可以换换思路：

 #include<iostream>
using namespace std;
int main()
{
    int a[9];
    int max=-1e9,min=1e9,sum=0;
    for(int i=0;i<9;i++){
        cin >> a[i];
        sum+=a[i];
        if(max<a[i])    max=a[i];
        if(min>a[i])    min=a[i];
    }
    cout << "和为" << sum << endl;
    cout << "最大值为" << max << endl;
    cout << "最小值为" << min;
}

试下换成这样去new 与delete

int **a;
a=new int*[3];
for(int i=0;i<3;i++)
    a[i]=new int[3]; 
for(int i=0;i<3;i++)
    delete[]a[i];
delete[]a;

或者将你第6行换成：
int(*a)[3] = nullptr;
a = new int[3][3];