diff --git a/src/8/22/P4551.cpp b/src/8/22/P4551.cpp
index 836d1cd..9b109b3 100644
--- a/src/8/22/P4551.cpp
+++ b/src/8/22/P4551.cpp
@@ -2,50 +2,44 @@
 #include <iostream>
 #include <vector>
 
-void fast_io() {
-    std::ios_base::sync_with_stdio(false);
-    std::cin.tie(nullptr);
-}
-
-const int MAXN = 100005;
-const int BITS = 31;
+const int MAXN = 1e5+5;
+const int bit = 31;
 std::vector<std::pair<int, int>> adj[MAXN];
 int dist[MAXN];
-namespace Trie {
-    int trie[MAXN * BITS][2];
+
+namespace t {
+    int t[MAXN * bit][2];
     int nodec;
 
     void init() {
-        trie[0][0] = trie[0][1] = 0;
+        t[0][0] = t[0][1] = 0;
         nodec = 1;
     }
 
     void insert(int val) {
         int curnode = 0;
-
-        for (int i = BITS - 1; i >= 0; --i) {
+        for (int i = bit - 1; i >= 0; --i) {
             int bit = (val >> i) & 1;
-            if (!trie[curnode][bit]) {
-
-                trie[nodec][0] = trie[nodec][1] = 0;
-                trie[curnode][bit] = nodec++;
+            if (!t[curnode][bit]) {
+                t[nodec][0] = t[nodec][1] = 0;
+                t[curnode][bit] = nodec++;
             }
-            curnode = trie[curnode][bit];
+            curnode = t[curnode][bit];
         }
     }
 
     int qmaxor(int val) {
         int curnode = 0;
         int maxorval = 0;
-        for (int i = BITS - 1; i >= 0; --i) {
+        for (int i = bit - 1; i >= 0; --i) {
             int bit = (val >> i) & 1;
 
-            if (trie[curnode][!bit]) {
+            if (t[curnode][!bit]) {
                 maxorval |= (1 << i);
-                curnode = trie[curnode][!bit];
+                curnode = t[curnode][!bit];
             } else {
 
-                curnode = trie[curnode][bit];
+                curnode = t[curnode][bit];
             }
         }
         return maxorval;
@@ -65,7 +59,8 @@ void dfs(int u, int p, int curxorsum) {
 }
 
 int main() {
-    fast_io();
+    std::ios_base::sync_with_stdio(false);
+    std::cin.tie(nullptr);
 
     int n;
     std::cin >> n;
@@ -80,14 +75,14 @@ int main() {
 
     dfs(1, 0, 0);
 
-    Trie::init();
+    t::init();
     for (int i = 1; i <= n; ++i) {
-        Trie::insert(dist[i]);
+        t::insert(dist[i]);
     }
 
     int max_ans = 0;
     for (int i = 1; i <= n; ++i) {
-        max_ans = std::max(max_ans, Trie::qmaxor(dist[i]));
+        max_ans = std::max(max_ans, t::qmaxor(dist[i]));
     }
 
     std::cout << max_ans << '\n';
diff --git a/src/8/23/discrete.cpp b/src/8/23/discrete.cpp
new file mode 100644
index 0000000..d39aa90
--- /dev/null
+++ b/src/8/23/discrete.cpp
@@ -0,0 +1,30 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <vector>
+using ll = int64_t;
+
+int main(){
+    ll m;
+    std::cin>>m;
+    std::vector<ll> arr;
+    arr.reserve(m);
+    for(ll i=1;i<=m;i++){
+        ll op;
+        std::cin>>op;
+        if(op==1){
+            ll x,y;
+            std::cin>>x>>y;
+            arr.push_back(x);
+        }else {
+            ll x,y;
+            std::cin>>x>>y;
+            arr.push_back(x);
+            arr.push_back(y);
+        }
+    }
+    std::sort(arr.begin(),arr.end());
+    arr.erase(std::unique(arr.begin(),arr.end()),arr.end());
+    for(ll i=0;i<arr.size();i++)std::cout<<arr[i]<<",";
+    std::cout<<'\n';
+}
\ No newline at end of file