diff --git a/.gitignore b/.gitignore
index a8a0dce..3e029e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,4 @@
 *.bin
+
+/cmake-build-debug
+/.idea
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..f643729
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.28)
+project(Playground)
+
+set(CMAKE_CXX_STANDARD 14)
+
+include_directories(.)
+
+add_executable(Playground
+        complete-backup/main.cc
+        counting-people/main.cc
+        factorization/main.cc
+        fastest-way2unified-data/main.cc
+        flip-card/main.cc
+        jumping-wooden-trunk/main.cc
+        longest-decreasing-subsequence/main.cc
+        palindrome-number/main.cc
+        pick-class/main.cc
+        plug-dp/main.cc
+        reporting-number/main.cc
+        simple-calculator/main.cc
+        state-compress-dp/main.cpp
+        sudoku/main.cc
+        take-most-space-element/main.cc
+        walking-in-maze/main.cc)
diff --git a/complete-backup/main.cc b/complete-backup/main.cc
index 0fd2451..42582a2 100644
--- a/complete-backup/main.cc
+++ b/complete-backup/main.cc
@@ -4,16 +4,16 @@ using namespace std;
 #define MAXN 10005
 #define M 105
 int dp[MAXN];
-int w[M], v[M];
+int w[M], state[M];
 int x[M];
 int main() {
   int n, W;
   cin >> W >> n;
   for (int i = 1; i <= n; i++)
-    cin >> w[i] >> v[i];
+    cin >> w[i] >> state[i];
   for (int i = 1; i <= n; i++)
     for (int j = w[i]; j <= W; j++)
-      dp[j] = max(dp[j], dp[j - w[i]] + v[i]);
+      dp[j] = max(dp[j], dp[j - w[i]] + state[i]);
   cout << dp[W] << endl;
   return 0;
 }
diff --git a/jumping-wooden-trunk/main.cc b/jumping-wooden-trunk/main.cc
index 19bd844..210284a 100644
--- a/jumping-wooden-trunk/main.cc
+++ b/jumping-wooden-trunk/main.cc
@@ -1,17 +1,17 @@
 #include <iostream>
 using namespace std;
 const int MAXN = 105;
-int dp[MAXN], arr[MAXN];
+int dp[MAXN], obstacle[MAXN];
 int main() {
   int n;
   cin >> n;
   for (int i = 1; i <= n; i++) {
-    cin >> arr[i];
+    cin >> obstacle[i];
     dp[i] = n - 1;
   }
   dp[1] = 0;
   for (int i = 1; i <= n; i++) {
-    for (int j = i + 1; j <= i + arr[i] && j <= n; j++) {
+    for (int j = i + 1; j <= i + obstacle[i] && j <= n; j++) {
       dp[j] = min(dp[j], dp[i] + 1);
     }
   }
diff --git a/longest-decreasing-subsequence/main.cc b/longest-decreasing-subsequence/main.cc
index 481927e..46d467d 100644
--- a/longest-decreasing-subsequence/main.cc
+++ b/longest-decreasing-subsequence/main.cc
@@ -3,13 +3,13 @@ using namespace std;
 #define MAXN 10005
 #define M 200
 int dp[MAXN];
-int arr[M];
+int obstacle[M];
 int longest_decreasing_subsequence(int n) {
   int maximun = 0;
   for (int i = 0; i < n; i++) {
     dp[i]++;
     for (int j = 0; j < i; j++) {
-      if (arr[j] > arr[i]) // 最大上升为 `arr[j] < arr[i]`
+      if (obstacle[j] > obstacle[i]) // 最大上升为 `obstacle[j] < obstacle[i]`
         dp[i] = max(dp[i], dp[j] + 1);
     }
     if (dp[i] > maximun)
@@ -21,7 +21,7 @@ int main() {
   int N;
   cin >> N;
   for (int i = 0; i < N; i++) {
-    cin >> arr[i];
+    cin >> obstacle[i];
   }
   int value = longest_decreasing_subsequence(N);
   cout << value << endl;
diff --git a/state-compress-dp/main.cpp b/state-compress-dp/main.cpp
new file mode 100644
index 0000000..9bef472
--- /dev/null
+++ b/state-compress-dp/main.cpp
@@ -0,0 +1,64 @@
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+int m, n;
+int obstacle[101];
+int dp[101][1025];
+
+const int MOD_FACTOR = 100000007;
+
+vector<int> state;
+
+void init_state() {
+    state.push_back(0);
+    for (int i = 0; i < (1 << n); i++) {
+        if (!(i & i << 1)) {
+            state.push_back(i);
+        }
+    }
+}
+
+void calculate() {
+    for (int j = 1; j < state.size(); j++) {
+        if (!(state[j] & obstacle[1])) { // Check overlap
+            dp[1][j] = 1;
+        }
+    }
+    for (int i = 2; i <= m; i++) {
+        for (int j = 1; j < state.size(); j++) {
+            if (!(state[j] & obstacle[i])) { // Check obstacle overlap
+                for (int k = 1; k < state.size(); k++) {
+                    if (!(state[j] & state[k])) { // Check overlap
+                        dp[i][j] = (dp[i][j] + dp[i - 1][k]) % MOD_FACTOR;
+                    }
+                }
+            }
+        }
+    }
+
+}
+
+int main() {
+    cin >> m >> n;
+    for (int i = 1; i <= m; i++) {
+        obstacle[i] = 0;
+        int num;
+        for (int j = 1; j <= n; j++) {
+            cin >> num;
+            if (num == 0) {
+                obstacle[i] += (1 << (n - j));
+            }
+        }
+    }
+
+    init_state();
+    calculate();
+    int ans = 0;
+    for (int j = 1; j < state.size(); j++) {
+        ans = (ans + dp[m][j]) % MOD_FACTOR;
+    }
+    cout << ans - 1 << endl;
+    return 0;
+}
\ No newline at end of file