style: format markdown files with remark-lint

??? note "参考代码"

    ```cpp

    #include <algorithm>

    #include <cstdio>

    #include <vector>

    #include <algorithm>

    using namespace std;

    int f[305][305], s[305], n, m;

    vector<int> e[305];

    int dfs(int u)

    {

    int dfs(int u) {

      int p = 1;

      f[u][1] = s[u];

     for(auto v:e[u])

     {

      for (auto v : e[u]) {

        int siz = dfs(v);

        for (int i = min(p, m + 1); i; i--)  // 只考虑已经合并过的子树

       for(int j=1;j<=siz&&i+j<=m+1;j++)// 选的课程数超过 m+1 的状态没有意义

          for (int j = 1; j <= siz && i + j <= m + 1;

               j++)  // 选的课程数超过 m+1 的状态没有意义

            f[u][i + j] = max(f[u][i + j], f[u][i] + f[v][j]);

        p += siz;

      }

      return p;

    }

    int main()

    {

    int main() {

      scanf("%d%d", &n, &m);

     for(int i=1;i<=n;i++)

     {

      for (int i = 1; i <= n; i++) {

        int k;

        scanf("%d%d", &k, &s[i]);

        e[k].push_back(i);