为什么它一直报错?
#include <iostream>
using namespace std;
int main() {
int n,i,j;
cin >> n;
int a[n][n];
for (i = 0; i < n; i++) {
a[i][0] = 1;
a[i][1] = 1;
}
for (i = 2; i < n; i++) {
for (j = 1; j < i; j++) {
a[i][j] = a[i - 1][j] + a[i - 1][j - 1];
}
}
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
cout << a[i][j] << " ";
}
cout << endl;
}
return 0;
}