style: format markdown files with remark-lint

H_n = \binom{2n}{n} - \binom{2n}{n-1}

$$

```

    f[n] = f[0] * f[n - 1] + f[1] * f[n - 2] + ... + f[n - 1] * f[0]

```

具体实例

[https://www.luogu.org/problem/P1044](洛谷 P1044 栈)

```

具体实例[https://www.luogu.org/problem/P1044]（洛谷 P1044 栈）

    #include <iostream>

    	cout << f[n] << endl;

    	return 0;

    }

```

## 路径计数问题