diff --git a/src/8/11/P11363.cpp b/src/8/11/P11363.cpp
new file mode 100644
index 0000000..534b29e
--- /dev/null
+++ b/src/8/11/P11363.cpp
@@ -0,0 +1,50 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <vector>
+
+using ll = int64_t;
+
+ll n,k,T,e;
+std::vector<std::vector<ll>> map;
+std::vector<ll> d,jc;
+const ll M = 1e9+7;
+
+void solve(){
+    std::cin>>n>>k;
+    map.clear();
+    map.resize(n+1);
+    d.clear();
+    d.resize(n+1);
+    for(ll i=1;i<=n-1;i++){
+        ll u,v;
+        std::cin>>u>>v;
+        map[u].push_back(v);
+        map[v].push_back(u);
+        d[u]++;
+        d[v]++;
+    }
+    std::cin>>e;
+    ll maxd=1;
+    for(ll i=1;i<=n-1;i++){
+        maxd=std::max(maxd,d[i]);
+    }
+    jc.clear();
+    jc.resize(maxd+1);
+    jc[1]=1;
+    for(ll i=2;i<=maxd;i++){
+        jc[i]=jc[i-1]*i%M;
+    }
+    ll ans=1;
+    for(ll i=1;i<=n-1;i++){
+        ans=(ans+jc[d[i]-1])%M;
+    }
+    std::cout<<(ans*2)%M<<'\n';
+}
+
+int main(){
+    std::cin>>T;
+    while(T--){
+        solve();
+    }
+}
\ No newline at end of file
diff --git a/src/8/11/P11364.cpp b/src/8/11/P11364.cpp
new file mode 100644
index 0000000..7beefe4
--- /dev/null
+++ b/src/8/11/P11364.cpp
@@ -0,0 +1,21 @@
+#include <cstdint>
+#include <iostream>
+#include <istream>
+#include <vector>
+
+using ll = int64_t;
+
+ll n;
+std::vector<std::vector<ll>> m;
+
+int main(){
+    std::cin>>n;
+    m.resize(n+1);
+    for(ll i=1;i<=n-1;i++){
+        ll u,v;
+        std::cin>>u>>v;
+        m[u].push_back(v);
+        m[v].push_back(u);
+    }
+    
+}
\ No newline at end of file
diff --git a/src/8/11/longest-substring-without-repeating-characters.cpp b/src/8/11/longest-substring-without-repeating-characters.cpp
new file mode 100644
index 0000000..f9ab38f
--- /dev/null
+++ b/src/8/11/longest-substring-without-repeating-characters.cpp
@@ -0,0 +1,39 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include<vector>
+using namespace std;
+
+class Solution {
+public:
+    int lengthOfLongestSubstring(std::string s) {
+
+        std::vector<int> last_pos(128, -1);
+        int n = s.length();
+        if (n == 0) {
+            return 0;
+        }
+        int max_len = 0;
+        int left = 0;
+
+        for (int right = 0; right < n; ++right) {
+
+            char current_char = s[right];
+
+            if (last_pos[current_char] >= left) {
+                left = last_pos[current_char] + 1;
+            }
+
+            last_pos[current_char] = right;
+
+            max_len = std::max(max_len, right - left + 1);
+        }
+        return max_len;
+    }
+};
+
+int main() {
+}
\ No newline at end of file
diff --git a/src/8/11/range-product-queries-of-powers.cpp b/src/8/11/range-product-queries-of-powers.cpp
new file mode 100644
index 0000000..e62ab5b
--- /dev/null
+++ b/src/8/11/range-product-queries-of-powers.cpp
@@ -0,0 +1,35 @@
+#include <climits>
+#include <cstdint>
+#include <vector>
+using namespace std;
+
+class Solution {
+    using ll = int64_t;
+public:
+    static inline ll lowbit(ll n){
+        return n&(-n);
+    }
+    constexpr vector<int> productQueries(int n, vector<vector<int>>& queries) {
+        const ll M=1e9+7;
+        vector<ll> v;
+        v.reserve(128);
+        while(lowbit(n)){
+            v.push_back(lowbit(n));
+            n-=lowbit(n);
+        }
+        vector<int> ans;
+        ans.reserve(queries.size());
+        for(ll i=0;i<queries.size();i++){
+            ll nans=1;
+            for(ll j=queries[i][0];j<=queries[i][1];j++){
+                nans=nans*v[j]%M;
+            }
+            ans.push_back(nans);
+        }
+        return ans;
+    }
+};
+
+int main(){
+
+}
\ No newline at end of file
diff --git a/src/8/11/two-sum.cpp b/src/8/11/two-sum.cpp
index 3a3ab79..1faaf74 100644
--- a/src/8/11/two-sum.cpp
+++ b/src/8/11/two-sum.cpp
@@ -17,4 +17,7 @@ public:
         }
         return {0,0};
     }
-};
\ No newline at end of file
+};
+int main(){
+    
+}
\ No newline at end of file