diff --git a/13lanqiao/test4-1.cpp b/13lanqiao/test4-1.cpp
new file mode 100644
index 0000000..2f565cc
--- /dev/null
+++ b/13lanqiao/test4-1.cpp
@@ -0,0 +1,37 @@
+// lanqiao 2107 修剪灌木(模拟法)
+#include<bits/stdc++.h>
+using namespace std;
+const int N = 1e4 + 10;
+int mxh[N];
+int main(){
+    int n; cin >> n;
+    vector<int> h(n);
+    for(int d = 1; d <= n; d++){
+        for(int i = 0; i < h.size(); i++){
+            h[i] += 1;
+            h[d-1] = 0;
+            mxh[i] = max(mxh[i], h[i]);
+        }
+    }
+    for(int d = n; d >= 1; d--){
+        for(int i = 0; i < h.size(); i++){
+            h[i] += 1;
+            h[d-1] = 0;
+            mxh[i] = max(mxh[i], h[i]);
+        }
+    }
+    for(int d = 1; d <= n; d++){
+        for(int i = 0; i < h.size(); i++){
+            h[i] += 1;
+            h[d-1] = 0;
+            mxh[i] = max(mxh[i], h[i]);
+        }
+    }
+    for(int i = 0; i < h.size(); i++){
+        cout << mxh[i] << endl;
+    }
+    return 0;
+}
+/* test samples -> 4 2 4
+3
+*/
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