输入行数，约定 1≤lineCount≤9，输出以下图形。应在 C++ 代码横线处填入（）。 

int lineCount = 0;
cout << "请输入行数量:";
cin >> lineCount;
for (int i = 0; i < lineCount; i++) {
    for (int j = 0; j < ____________; j++) // 此处填写代码
        cout << ' ';
    for (int j = 1; j < i + 1; j++)
        cout << j << " ";
    for (int j = i + 1; j > 0; j--)
        cout << j << " ";
    cout << endl;
}

{{ select(1) }}

• (lineCount - i - 1) * 2
• (lineCount - i) * 2
• lineCount - i - 1
• lineCount - i