diff --git a/HDOJ/5877_angon823.cpp b/HDOJ/5877_angon823.cpp
new file mode 100644
index 0000000..9e9b88c
--- /dev/null
+++ b/HDOJ/5877_angon823.cpp
@@ -0,0 +1,319 @@
+#include<stdio.h>
+#include<stdlib.h>
+#define MAXN 200005
+int cnt = 1, rt = 0;
+int Add[MAXN];
+
+struct Tree{
+	long long key;
+	int num, size, fa, son[2];
+}T[MAXN];
+
+inline void PushUp(int x)
+{
+	T[x].size = T[T[x].son[0]].size + T[T[x].son[1]].size + T[x].num;
+}
+
+inline void PushDown(int x)
+{
+	if (Add[x])
+	{
+		if (T[x].son[0])
+		{
+			T[T[x].son[0]].key += Add[x];
+			Add[T[x].son[0]] += Add[x];
+		}
+		if (T[x].son[1])
+		{
+			T[T[x].son[1]].key += Add[x];
+			Add[T[x].son[1]] += Add[x];
+		}
+		Add[x] = 0;
+	}
+}
+
+inline int Newnode(long long key, int fa) //新建一个节点并返回
+{
+	++cnt;
+	T[cnt].key = key;
+	T[cnt].num = T[cnt].size = 1;
+	T[cnt].fa = fa;
+	T[cnt].son[0] = T[cnt].son[1] = 0;
+	return cnt;
+}
+
+inline void Rotate(int x, int p) //0左旋 1右旋
+{
+	int y = T[x].fa;
+	PushDown(y);
+	PushDown(x);
+	T[y].son[!p] = T[x].son[p];
+	T[T[x].son[p]].fa = y;
+	T[x].fa = T[y].fa;
+	if (T[x].fa)
+		T[T[x].fa].son[T[T[x].fa].son[1] == y] = x;
+	T[x].son[p] = y;
+	T[y].fa = x;
+	PushUp(y);
+	PushUp(x);
+}
+
+void Splay(int x, int To) //将x节点移动到To的子节点中
+{
+	while (T[x].fa != To)
+	{
+		if (T[T[x].fa].fa == To)
+			Rotate(x, T[T[x].fa].son[0] == x);
+		else
+		{
+			int y = T[x].fa, z = T[y].fa;
+			int p = (T[z].son[0] == y);
+			if (T[y].son[p] == x)
+				Rotate(x, !p), Rotate(x, p); //之字旋
+			else
+				Rotate(y, p), Rotate(x, p); //一字旋
+		}
+	}
+	if (To == 0) rt = x;
+}
+
+int GetPth(int p, int To) //返回第p小的节点 并移动到To的子节点中
+{
+	if (!rt || p > T[rt].size) return 0;
+	int x = rt;
+	while (x)
+	{
+		PushDown(x);
+		if (p >= T[T[x].son[0]].size + 1 && p <= T[T[x].son[0]].size + T[x].num)
+			break;
+		if (p > T[T[x].son[0]].size + T[x].num)
+		{
+			p -= T[T[x].son[0]].size + T[x].num;
+			x = T[x].son[1];
+		}
+		else
+			x = T[x].son[0];
+	}
+	Splay(x, 0);
+	return x;
+}
+
+int Find(long long key) //返回值为key的节点 若无返回0 若有将其转移到根处
+{
+	if (!rt) return 0;
+	int x = rt;
+	while (x)
+	{
+		PushDown(x);
+		if (T[x].key == key) break;
+		x = T[x].son[key > T[x].key];
+	}
+	if (x) Splay(x, 0);
+	return x;
+}
+
+int Prev() //返回根节点的前驱 非重点
+{
+	if (!rt || !T[rt].son[0]) return 0;
+	int x = T[rt].son[0];
+	while (T[x].son[1])
+	{
+		PushDown(x);
+		x = T[x].son[1];
+	}
+	Splay(x, 0);
+	return x;
+}
+
+int Succ() //返回根结点的后继 非重点
+{
+	if (!rt || !T[rt].son[1]) return 0;
+	int x = T[rt].son[1];
+	while (T[x].son[0])
+	{
+		PushDown(x);
+		x = T[x].son[0];
+	}
+	Splay(x, 0);
+	return x;
+}
+
+void Insert(long long key) //插入key值
+{
+	if (!rt)
+		rt = Newnode(key, 0);
+	else
+	{
+		int x = rt, y = 0;
+		while (x)
+		{
+			PushDown(x);
+			y = x;
+			if (T[x].key == key)
+			{
+				T[x].num++;
+				T[x].size++;
+				break;
+			}
+			T[x].size++;
+			x = T[x].son[key > T[x].key];
+		}
+		if (!x)
+			x = T[y].son[key > T[y].key] = Newnode(key, y);
+		Splay(x, 0);
+	}
+}
+
+void Delete(long long key) //删除值为key的节点1个
+{
+	int x = Find(key);
+	if (!x) return;
+	if (T[x].num>1)
+	{
+		T[x].num--;
+		PushUp(x);
+		return;
+	}
+	int y = T[x].son[0];
+	while (T[y].son[1])
+		y = T[y].son[1];
+	int z = T[x].son[1];
+	while (T[z].son[0])
+		z = T[z].son[0];
+	if (!y && !z)
+	{
+		rt = 0;
+		return;
+	}
+	if (!y)
+	{
+		Splay(z, 0);
+		T[z].son[0] = 0;
+		PushUp(z);
+		return;
+	}
+	if (!z)
+	{
+		Splay(y, 0);
+		T[y].son[1] = 0;
+		PushUp(y);
+		return;
+	}
+	Splay(y, 0);
+	Splay(z, y);
+	T[z].son[0] = 0;
+	PushUp(z);
+	PushUp(y);
+}
+
+int GetRank(long long key) //获得值<=key的节点个数
+{
+	if (!Find(key))
+	{
+		Insert(key);
+		int tmp = T[T[rt].son[0]].size;
+		Delete(key);
+		return tmp;
+	}
+	else
+		return T[T[rt].son[0]].size + T[rt].num;
+}
+
+void Delete(int l, int r) //删除值在[l, r]中的所有节点 l!=r
+{
+	if (!Find(l)) Insert(l);
+	int p = Prev();
+	if (!Find(r)) Insert(r);
+	int q = Succ();
+	if (!p && !q)
+	{
+		rt = 0;
+		return;
+	}
+	if (!p)
+	{
+		T[rt].son[0] = 0;
+		PushUp(rt);
+		return;
+	}
+	if (!q)
+	{
+		Splay(p, 0);
+		T[rt].son[1] = 0;
+		PushUp(rt);
+		return;
+	}
+	Splay(p, q);
+	T[p].son[1] = 0;
+	PushUp(p);
+	PushUp(q);
+}
+#define MAX 100005
+#include<vector>
+#include<memory.h>
+using namespace std;
+int v[MAX];
+int N;
+long long K;
+long long res = 0;
+struct Edge
+{
+	int b;
+	int next;
+}edge[MAX];
+int edgeCnt = 1;
+int adj[MAX];
+void AddEdge(int a, int b)
+{
+	edge[edgeCnt].b = b;
+	edge[edgeCnt].next = adj[a];
+	adj[a] = edgeCnt++;
+}
+void Search(int now)
+{
+	res += GetRank(K / v[now]);
+	Insert(v[now]);
+	for(int p = adj[now]; p; p = edge[p].next)
+	{
+		Search(edge[p].b);
+	}
+	Delete(v[now]);
+}
+int in[MAX];
+int main() {
+	int T;
+	while(~scanf("%d", &T))
+    {
+        int i;
+        int a, b;
+        for (; T; T--)
+        {
+            scanf("%d%lld", &N, &K);
+            memset(adj, 0, (N + 1) * sizeof(int));
+            memset(in, 0, (N + 1) * sizeof(int));
+            edgeCnt = 1;
+            for (i = 1; i <= N; i++)
+            {
+                scanf("%d", &v[i]);
+            }
+            for (i = 1; i < N; i++)
+            {
+                scanf("%d%d", &a, &b);
+                in[b]++;
+                AddEdge(a, b);
+            }
+            for (i = 1; i <= N; i++)
+            {
+                if (in[i] == 0)
+                {
+                    break;
+                }
+            }
+            cnt = 1, rt = 0;
+            res = 0;
+            Search(i);
+            printf("%lld\n", res);
+        }
+    }
+	return 0;
+}