g8-06051. GESP-8级-2024-09-单选-第09题 未做

下列程序实现了输出杨辉三角形，代码中横线部分应该填⼊的是（ ）。

#include <iostream>
using namespace std;
#define N 35
int a[N][N];
int main() {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= i; j++) {
            if (j == 1 || j == i)
                a[i][j] = 1;
            else
                __________ // 在此处填入选项
        }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++)
            cout << a[i][j];
        cout<<endl;
    }
    return 0;
}

• A. a[i][j] = a[i - 1][j - 1] + a[i - 1][j];
• B. a[i][j] = a[i][j - 1] + a[i - 1][j];
• C. a[i][j] = a[i - 1][j] + a[i - 1][j];
• D. a[i][j] = a[i - 1][j - 1] + a[i][j];