diff --git a/96. Unique Binary Search Trees.cpp b/96. Unique Binary Search Trees.cpp
new file mode 100644
index 0000000..7be39aa
--- /dev/null
+++ b/96. Unique Binary Search Trees.cpp	
@@ -0,0 +1,11 @@
+class Solution {
+public:
+    int dp[20]{};
+    int numTrees(int n) {
+        if(n <= 1) return 1;
+        if(dp[n]) return dp[n];
+        for(int i = 1; i <= n; i++) 
+            dp[n] += numTrees(i-1) * numTrees(n-i);
+        return dp[n];
+    }
+};
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