diff --git a/src/7/28/P11233.cpp b/src/7/28/P11233.cpp
new file mode 100644
index 0000000..294989d
--- /dev/null
+++ b/src/7/28/P11233.cpp
@@ -0,0 +1,3 @@
+int main(){
+    
+}
\ No newline at end of file
diff --git a/src/7/29/T642397.cpp b/src/7/29/T642397.cpp
new file mode 100644
index 0000000..5305b1c
--- /dev/null
+++ b/src/7/29/T642397.cpp
@@ -0,0 +1,97 @@
+#include <iostream>
+#include <queue>
+#include <cstring>
+using namespace std;
+
+const int N = 5005;
+int dp[N][N];
+string s, t;
+int n, m;
+queue<pair<int, int>> q;
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    getline(cin, s);
+    getline(cin, t);
+    n = s.size();
+    m = t.size();
+
+    if (s == t) {
+        cout << 0 << '\n';
+        return 0;
+    }
+
+    bool found = false;
+    for (int i = 0; i <= n - m; i++) {
+        if (s.substr(i, m) == t) {
+            found = true;
+            break;
+        }
+    }
+    if (!found) {
+        cout << -1 << '\n';
+        return 0;
+    }
+
+    memset(dp, -1, sizeof(dp));
+    for (int i = 0; i < n; i++) {
+        for (int j = i; j < n; j++) {
+            if (j - i + 1 < m) continue;
+            if (s.substr(i, m) == t) {
+                dp[i][i + m - 1] = 0;
+                q.push({i, i + m - 1});
+            }
+        }
+    }
+
+    while (!q.empty()) {
+        auto [l, r] = q.front(); q.pop();
+        if (l == 0 && r == n - 1) {
+            cout << dp[l][r] << '\n';
+            return 0;
+        }
+
+        if (l > 0) {
+            for (int a = l - 1; a >= 0; a--) {
+                int len = l - a;
+                bool cannot = false;
+                for (int i = l; i <= r - len + 1; i++) {
+                    if (s.substr(i, len) == s.substr(a, len)) {
+                        cannot = true;
+                        break;
+                    }
+                }
+                if (cannot) {
+                    if (dp[a][r] == -1) {
+                        dp[a][r] = dp[l][r] + 1;
+                        q.push({a, r});
+                    }
+                }
+            }
+        }
+
+        if (r < n - 1) {
+            for (int b = r + 1; b < n; b++) {
+                int len = b - r;
+                bool cannot = false;
+                for (int i = l; i <= r - len + 1; i++) {
+                    if (s.substr(i, len) == s.substr(r + 1, len)) {
+                        cannot = true;
+                        break;
+                    }
+                }
+                if (cannot) {
+                    if (dp[l][b] == -1) {
+                        dp[l][b] = dp[l][r] + 1;
+                        q.push({l, b});
+                    }
+                }
+            }
+        }
+    }
+
+    cout << -1 << '\n';
+    return 0;
+}
\ No newline at end of file