diff --git a/AcWing/285/285.cpp b/AcWing/285/285.cpp
new file mode 100644
index 00000000..0f4d9586
--- /dev/null
+++ b/AcWing/285/285.cpp
@@ -0,0 +1,50 @@
+#include <iostream>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 6005;
+
+int n, h[N], f[N][2], root;
+std::vector<int> g[N];
+bool vis[N];
+
+void dfs(int u) {
+    f[u][0] = 0;
+    f[u][1] = h[u];
+
+    for (int v : g[u]) {
+        dfs(v);
+        f[u][0] += std::max(f[v][0], f[v][1]);
+        f[u][1] += f[v][0];
+    }
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> h[i];
+    }
+    for (int i = 1, l, k; i < n; i++) {
+        cin >> l >> k;
+        vis[l] = true;
+        g[k].push_back(l);
+    }
+
+    for (int i = 1; i <= n; i++) {
+        if (!vis[i]) {
+            root = i;
+            break;
+        }
+    }
+
+    dfs(root);
+
+    cout << std::max(f[root][0], f[root][1]) << endl;
+
+    return 0;
+}
diff --git a/AcWing/285/data/7.ans b/AcWing/285/data/7.ans
new file mode 100644
index 00000000..d595cdb8
--- /dev/null
+++ b/AcWing/285/data/7.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7de1555df0c2700329e815b93b32c571c3ea54dc967b89e81ab73b9972b72d1d
+size 2
diff --git a/AcWing/285/data/7.in b/AcWing/285/data/7.in
new file mode 100644
index 00000000..80126c2e
--- /dev/null
+++ b/AcWing/285/data/7.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d6e98d66a8a7b45c497b34232c11797b070c76b6f1a376a17e7a6acd903e470d
+size 43