求助

#include<bits/stdc++.h>
using namespace std;

int main()
{
	int a[30][30] = {},n;
	cin >> n;
	a[1][1] = 1;
	for(int i = 2;i <= n;i++)
	{
		for(int j = 1;j <= i;j++)
		{
			a[i][j] = a[i - 1][j] + a[i - 1][j - 1];
		}
	}
	for(int i = 1;i <= n;i++)
	{
		for(int j = 1;j <= i;j++)
		{
			cout << a[i][j] << " ";
		}
		cout << endl;
	}
	return 0;
 }

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 6 1
1 7 21 35 35 21 7 1
1 8 28 56 70 56 28 8 1
1 9 36 84 126 126 84 36 9 1