diff --git a/Luogu/SP16549/SP16549.cpp b/Luogu/SP16549/SP16549.cpp
deleted file mode 100644
index 7a185b00..00000000
--- a/Luogu/SP16549/SP16549.cpp
+++ /dev/null
@@ -1,188 +0,0 @@
-#include <iostream>
-#include <stack>
-
-using std::cin;
-using std::cout;
-const char endl = '\n';
-
-const int N = 1e5 + 5;
-
-int n, m;
-
-class LinkCutTree {
-  private:
-    struct node {
-        size_t l, r, f;
-        unsigned v, s;
-        bool rev;
-
-        node()
-            : l(0), r(0), f(0), s(0), v(0), rev(false) {}
-
-        node(unsigned _v, size_t _f)
-            : l(0), r(0), f(_f), s(_v), v(_v), rev(false) {}
-
-        size_t &child(unsigned x) {
-            return !x ? l : r;
-        }
-    } tr[N];
-
-    inline void pushup(size_t u) {
-        tr[u].s = tr[tr[u].l].s + tr[u].v + tr[tr[u].r].s;
-    }
-
-    inline void pushdown(const size_t &u) {
-        if (!tr[u].rev) return;
-
-        std::swap(tr[u].l, tr[u].r);
-        tr[tr[u].l].rev = !tr[tr[u].l].rev;
-        tr[tr[u].r].rev = !tr[tr[u].r].rev;
-        tr[u].rev = false;
-    }
-
-    unsigned relation(const size_t &u) {
-        return u == tr[tr[u].f].l ? 0 : 1;
-    }
-
-    bool isRoot(const size_t &u) {
-        return tr[tr[u].f].l != u && tr[tr[u].f].r != u;
-    }
-
-    void rotate(size_t u) {
-        size_t p = tr[u].f;
-        unsigned x = relation(u);
-
-        if (!isRoot(p)) {
-            tr[tr[p].f].child(relation(p)) = u;
-        }
-        tr[u].f = tr[p].f;
-
-        if (tr[u].child(x ^ 1)) {
-            tr[tr[u].child(x ^ 1)].f = p;
-        }
-        tr[p].child(x) = tr[u].child(x ^ 1);
-
-        tr[u].child(x ^ 1) = p;
-        tr[p].f = u;
-
-        pushup(p);
-        pushup(u);
-    }
-
-    void splay(size_t u) {
-        std::stack<size_t> st;
-
-        size_t cur = u;
-        st.push(cur);
-        while (!isRoot(cur)) {
-            st.push(tr[cur].f);
-            cur = tr[cur].f;
-        }
-
-        while (!st.empty()) {
-            pushdown(st.top());
-            st.pop();
-        }
-
-        while (!isRoot(u)) {
-            if (isRoot(tr[u].f)) {
-                rotate(u);
-            } else if (relation(u) == relation(tr[u].f)) {
-                rotate(tr[u].f);
-                rotate(u);
-            } else {
-                rotate(u);
-                rotate(u);
-            }
-        }
-    }
-
-    void access(size_t u) {
-        for (size_t f = 0; u; u = tr[f = u].f) {
-            splay(u);
-            tr[u].r = f;
-            pushup(u);
-        }
-    }
-
-    void makeRoot(const size_t &u) {
-        access(u);
-        splay(u);
-        tr[u].rev = !tr[u].rev;
-    }
-
-    size_t findRoot(size_t u) {
-        access(u);
-        splay(u);
-
-        while (tr[u].l) {
-            u = tr[u].l;
-        }
-
-        return u;
-    }
-
-    void split(const size_t &x, const size_t &y) {
-        makeRoot(x);
-        access(y);
-        splay(y);
-    }
-
-  public:
-    void set(int p, int v) {
-        tr[p].s = tr[p].v = v;
-    }
-
-    unsigned query(int x, int y) {
-        split(x, y);
-
-        return tr[y].s;
-    }
-
-    bool check(int x, int y) {
-        return findRoot(x) == findRoot(y);
-    }
-
-    void link(const int &x, const int &y) {
-        makeRoot(x);
-
-        if (findRoot(y) != x) {
-            tr[x].f = y;
-        }
-    }
-
-    void cut(int x, int y) {
-        split(x, y);
-
-        if (tr[y].l == x) {
-            tr[y].l = 0;
-            tr[x].f = 0;
-        }
-    }
-
-    void change(int p, int v) {
-        access(p);
-        splay(p);
-        tr[p].v = v;
-        pushup(p);
-    }
-} lct[2];
-
-int main() {
-    std::ios::sync_with_stdio(false);
-    cin.tie(nullptr);
-
-    cin >> n;
-
-    for (int i = 1, x, y; i < n; i++) {
-        cin >> x >> y;
-    }
-
-    cin >> m;
-
-    while (m--) {
-        //
-    }
-
-    return 0;
-}
diff --git a/S2OJ/1818/1818.cpp b/S2OJ/1818/1818.cpp
deleted file mode 100644
index 20a7fe2d..00000000
--- a/S2OJ/1818/1818.cpp
+++ /dev/null
@@ -1,106 +0,0 @@
-#include <iostream>
-#include <queue>
-#include <vector>
-
-using std::cin;
-using std::cout;
-const char endl = '\n';
-
-const int N = 2e6 + 5;
-const int INF = 0x3f3f3f3f;
-
-int n, q, t, cnt = 1, pos = 1, lst,
-             a[N], dep[N], fa[N][std::__lg(N) + 1];
-std::vector<int> g[N];
-
-void bfs(int s) {
-    std::fill_n(dep, N, INF);
-
-    std::queue<int> q;
-
-    q.emplace(s);
-    dep[0] = 0;
-    dep[s] = 1;
-
-    while (!q.empty()) {
-        int u = q.front();
-        q.pop();
-
-        for (int v : g[u]) {
-            if (dep[v] > dep[u] + 1) {
-                dep[v] = dep[u] + 1;
-                q.emplace(v);
-                fa[v][0] = u;
-
-                for (int k = 1; k <= std::__lg(n); k++) {
-                    fa[v][k] = fa[fa[v][k - 1]][k - 1];
-                }
-            }
-        }
-    }
-}
-
-int lca(int x, int y) {
-    if (dep[x] < dep[y]) std::swap(x, y);
-
-    for (int k = std::__lg(n); k >= 0; k--) {
-        if (dep[fa[x][k]] >= dep[y]) {
-            x = fa[x][k];
-        }
-    }
-
-    if (x == y) return x;
-
-    for (int k = std::__lg(n); k >= 0; k--) {
-        if (fa[x][k] != fa[y][k]) {
-            x = fa[x][k];
-            y = fa[y][k];
-        }
-    }
-
-    return fa[x][0];
-}
-
-constexpr int get(int x) {
-    return x * (x - 1) / 2;
-}
-
-int main() {
-    std::ios::sync_with_stdio(false);
-    cin.tie(nullptr);
-
-    cin >> n >> q >> t;
-
-    for (int i = 1; i <= n; i++) {
-        cin >> a[i];
-    }
-
-    for (int i = 1; i <= n; i++) {
-        for (int j = i * (i - 1) / 2 + 1; j <= i * (i - 1) / 2 + i; j++) {
-            if (a[pos] == j) {
-                g[j].emplace_back(++cnt);
-                g[j].emplace_back(++cnt);
-
-                pos++;
-            } else {
-                g[j].emplace_back(++cnt);
-            }
-        }
-    }
-
-    bfs(1);
-
-    while (q--) {
-        int x, y;
-
-        cin >> x >> y;
-
-        x = (x - 1 + t * lst) % ((n + 1) * (n + 2) / 2) + 1;
-        y = (y - 1 + t * lst) % ((n + 1) * (n + 2) / 2) + 1;
-
-        cout << (lst = lca(x, y)) << endl;
-    }
-
-    return 0;
-}
-