diff --git a/S2OJ/9/9.cpp b/S2OJ/9/9.cpp
new file mode 100644
index 00000000..3c6bd586
--- /dev/null
+++ b/S2OJ/9/9.cpp
@@ -0,0 +1,30 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 20005;
+
+int s, n, a[N], f[N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> s >> n;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = s; j >= a[i]; j--) {
+            f[j] = std::max(f[j], f[j - a[i]] + a[i]);
+        }
+    }
+
+    cout << s - f[s] << endl;
+
+    return 0;
+}
diff --git a/S2OJ/9/data/ex_land1.in b/S2OJ/9/data/ex_land1.in
new file mode 100644
index 00000000..c83a2544
--- /dev/null
+++ b/S2OJ/9/data/ex_land1.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ed321f9ab87e3c04967fa82339968cbe2c63489151a88a38780b61477bad2433
+size 18
diff --git a/S2OJ/9/data/ex_land1.out b/S2OJ/9/data/ex_land1.out
new file mode 100644
index 00000000..804fcc90
--- /dev/null
+++ b/S2OJ/9/data/ex_land1.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9a271f2a916b0b6ee6cecb2426f0b3206ef074578be55d9bc94f6f3fe3ab86aa
+size 2
diff --git a/S2OJ/9/data/land1.in b/S2OJ/9/data/land1.in
new file mode 100644
index 00000000..23fb5f8a
--- /dev/null
+++ b/S2OJ/9/data/land1.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:dcbd5eeecc108f62479b0670050a35f39638ecc2f4ad8627b959f090458df457
+size 31
diff --git a/S2OJ/9/data/land1.out b/S2OJ/9/data/land1.out
new file mode 100644
index 00000000..60f093fb
--- /dev/null
+++ b/S2OJ/9/data/land1.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a9742eb8ee320e006666aef25ae9aeed948247f3125c9cafa7cf97b7e7467dd5
+size 3
diff --git a/S2OJ/9/data/land2.in b/S2OJ/9/data/land2.in
new file mode 100644
index 00000000..d37e65e7
--- /dev/null
+++ b/S2OJ/9/data/land2.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:633e66c4b7c2eade19c761667a3f28ac5575fad98a7027f7e8b585d8f7f54512
+size 53
diff --git a/S2OJ/9/data/land2.out b/S2OJ/9/data/land2.out
new file mode 100644
index 00000000..1afab5f7
--- /dev/null
+++ b/S2OJ/9/data/land2.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4355a46b19d348dc2f57c046f8ef63d4538ebb936000f3c9ee954a27460dd865
+size 2
diff --git a/S2OJ/9/data/land3.in b/S2OJ/9/data/land3.in
new file mode 100644
index 00000000..61e4b583
--- /dev/null
+++ b/S2OJ/9/data/land3.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:70d9b4703d10610e092362da11b359f225302e3e83ff61bfdae275f2f957de39
+size 64
diff --git a/S2OJ/9/data/land3.out b/S2OJ/9/data/land3.out
new file mode 100644
index 00000000..1afab5f7
--- /dev/null
+++ b/S2OJ/9/data/land3.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4355a46b19d348dc2f57c046f8ef63d4538ebb936000f3c9ee954a27460dd865
+size 2
diff --git a/S2OJ/9/data/land4.in b/S2OJ/9/data/land4.in
new file mode 100644
index 00000000..9972c447
--- /dev/null
+++ b/S2OJ/9/data/land4.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7c9a71753bb6e144128457f3e5e959e69b86237dc7c0e40cdecc373f4b6c5b37
+size 150
diff --git a/S2OJ/9/data/land4.out b/S2OJ/9/data/land4.out
new file mode 100644
index 00000000..cb90f684
--- /dev/null
+++ b/S2OJ/9/data/land4.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:06e9d52c1720fca412803e3b07c4b228ff113e303f4c7ab94665319d832bbfb7
+size 2
diff --git a/S2OJ/9/data/land5.in b/S2OJ/9/data/land5.in
new file mode 100644
index 00000000..fce7cd4f
--- /dev/null
+++ b/S2OJ/9/data/land5.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8e8766cbe0e8228b78482f83acdbf9fefdf274edb9540ca69d7fdcbe57be5384
+size 11
diff --git a/S2OJ/9/data/land5.out b/S2OJ/9/data/land5.out
new file mode 100644
index 00000000..1afab5f7
--- /dev/null
+++ b/S2OJ/9/data/land5.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4355a46b19d348dc2f57c046f8ef63d4538ebb936000f3c9ee954a27460dd865
+size 2
diff --git a/S2OJ/9/data/problem.conf b/S2OJ/9/data/problem.conf
new file mode 100644
index 00000000..708cdd9c
--- /dev/null
+++ b/S2OJ/9/data/problem.conf
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:707af40625cb114cbf9e185c9f5f96b8a6b9cbc70678a47a1ad37bc6642170c3
+size 192