diff --git a/.DS_Store b/.DS_Store
index 9b6c09a..d860022 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git "a/T3-\354\204\261\355\230\204/11724 \354\227\260\352\262\260\354\232\224\354\206\214.java" "b/T3-\354\204\261\355\230\204/11724 \354\227\260\352\262\260\354\232\224\354\206\214.java"
new file mode 100644
index 0000000..52dd79b
--- /dev/null
+++ "b/T3-\354\204\261\355\230\204/11724 \354\227\260\352\262\260\354\232\224\354\206\214.java"	
@@ -0,0 +1,50 @@
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.StringTokenizer;
+
+public class Main{
+    static boolean visited[];
+    static ArrayList<Integer>[] A;
+    public static void main(String[] args) throws IOException{
+        BufferedReader bf=new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizerst=new StringTokenizer(br.readLine()); //SyringTokenizer?
+        int n=Integer.parseInt(st.nextToken());
+        int m=Integer.parseInt(st.nextToken());
+        visited=new boolean[n+1];  //visted=Main(visited)
+        A=new ArrayList[n+1];
+        (for int i=1;i<n+1;i++){
+            A[i]=new ArrayList<Integer>();
+        }
+        (for int i=0;i<m;i++){
+        st=new StringTokenizer(br.readLine());
+        int i=Integer.parseInt(st.nextToken());
+        int e=Integer.parseInt(st.nextToken());
+        A[s].add(e);
+        A[e].add(s);
+            
+            
+        }
+        int cnt=0;
+        for(int i=1;i<n+1;i++){
+            if(!visited[i]){
+                cnt++;
+                DFS(i);
+            }
+        }
+        System.out.println(cnt);
+        
+        
+}
+    private static void DFS(int i) {
+        if(visited[i]){
+            return;
+        }
+        visited[i]=true;
+        for(int i:A[v]) {
+            if(!visited[i]) {
+                DFS(i);
+            }
+        }
+    }
+}
diff --git "a/T3-\354\204\261\355\230\204/1427 why wrong.java" "b/T3-\354\204\261\355\230\204/1427 why wrong.java"
new file mode 100644
index 0000000..c05e3be
--- /dev/null
+++ "b/T3-\354\204\261\355\230\204/1427 why wrong.java"	
@@ -0,0 +1,17 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BUfferedReader br=new BufferedReader(new InputStreamReader(System.in));
+        int[] array=Arrays.stream(br.readLine().split("")).mapToInt(Integer::parseInt);
+        Arrays.sort(array);
+
+        StringBuilder sb=new StringBuilder();
+        for(int i=array.length-1;i>=0;i--){
+            sb.append(array[i]);
+        }
+        System.out.println(sb);
+    }
\ No newline at end of file
diff --git "a/T3-\354\204\261\355\230\204/1427 \353\202\264\353\246\274\354\260\250\354\210\230 \354\240\225\353\240\254.java" "b/T3-\354\204\261\355\230\204/1427 \353\202\264\353\246\274\354\260\250\354\210\230 \354\240\225\353\240\254.java"
new file mode 100644
index 0000000..0195226
--- /dev/null
+++ "b/T3-\354\204\261\355\230\204/1427 \353\202\264\353\246\274\354\260\250\354\210\230 \354\240\225\353\240\254.java"	
@@ -0,0 +1,30 @@
+import java.util.Scanner;
+import java.util.ArrayList;
+
+public class Main{
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        String a=sc.next();
+        int b[]=new int[a.length()];
+        for(int i=0;i<b.length;i++){
+            b[i]=Integer.parseInt(a.substring(i,i+1));
+        }
+        for(int i=0;i<b.length;i++){
+            int max=i;
+            for(int j=i+1;j<b.length;j++){
+                if(b[j]>b[max]){
+                    max=j;
+                }
+            }
+            if(b[i]<b[max]){
+                int temp=b[i];
+                b[i]=b[max];
+                b[max]=temp;
+            }
+        }
+        for(int i=0;i<b.length;i++){
+            System.out.print(b[i]);
+        }
+
+    }
+}
diff --git "a/T3-\354\204\261\355\230\204/15961 deque why.cpp" "b/T3-\354\204\261\355\230\204/15961 deque why.cpp"
new file mode 100644
index 0000000..6253b9b
--- /dev/null
+++ "b/T3-\354\204\261\355\230\204/15961 deque why.cpp"	
@@ -0,0 +1,45 @@
+#include <iostream>
+#include <vector>
+#include <queue>
+
+using namespace std;
+
+int sushi[3001]={0};
+int main() {
+    cin.tie(0); cout.tie(0); ios::sync_with_stdio(false);
+    int n,d,k,c;
+    cin>>n>>d>>k>>>c;
+    vector<int> dish(n);
+    for(int i=0;i<n;i++) cin>>dish[i];
+    
+    deque<int> dq;
+    int result=0;
+    int cntt=0;
+    for(int i=0;i<k;i++){
+        int val=0;
+        dq.push_back(dish[i]);
+        if(!sushi[dish[i]]){
+            cnt++;
+        }
+        sushi[dish[i]]++;
+    }
+    result=cnt;
+    
+    for(int i=0;i<dish.size();i++)
+    {
+        int del=dq.front();
+        dq.pop_front();
+        sushi[del]--;
+        if(!sushi[del]) cnt--;
+        
+        dq.push_back(dish[(i+k)%n]);
+        if(!sushi[dish[(i+k)%n]]) cnt++;
+        sushi[dish[(i+k)%n]]++;
+        
+        if(!suushi[c]) {
+            result=max(result,cnt+1);
+        }
+        else result=max(result,cnt);
+    }
+    cout<<result;
+}
\ No newline at end of file
diff --git "a/T3-\354\204\261\355\230\204/15961 deque why.java " "b/T3-\354\204\261\355\230\204/15961 deque why.java "
new file mode 100644
index 0000000..88af204
--- /dev/null
+++ "b/T3-\354\204\261\355\230\204/15961 deque why.java "	
@@ -0,0 +1,37 @@
+import java.util.*;
+import java.io.*;
+
+public class Main{
+    public static void main(String[] args) throws IOException {
+        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st=new StringTokenizer(br.readLine());
+        int n=Integer.parseInt(st.nextToken());
+        int d=Integer.parseInt(st.nextToken());
+        int k=Integer.parseInt(st.nextToken());
+        int c=Integer.parseInt(st.nextToken());
+        int[] a=new int[n];
+        int[] check=new int[d+1];
+        
+        for(int i=0;i<n;i++) a[i]=Integer.parseInt(br.readLine());
+        
+        int res=1;
+        check[c]++;
+        for(int i=0;i<k;i++) {
+            if(check[a[i]]==0) res++;
+            check[a[i]]++;
+        }
+        int cnt=res;
+        for(int i=1;i<n;i++) {
+            int pop=a[i-1];
+            check[pop]--;
+            if(check[pop]==0) cnt--;
+            
+            int add=a[(i+k-1)%n];
+            if(check[add]==0) cnt++;
+            check[add]++;
+            
+            res=Math.max(res,cnt);
+        }
+        System.out.println(res);
+    }
+}
\ No newline at end of file
diff --git "a/T3-\354\204\261\355\230\204/1874.py" "b/T3-\354\204\261\355\230\204/1874 stack x.py"
similarity index 100%
rename from "T3-\354\204\261\355\230\204/1874.py"
rename to "T3-\354\204\261\355\230\204/1874 stack x.py"
diff --git "a/T3-\354\204\261\355\230\204/2750 \354\230\244\353\246\204\354\260\250\354\210\230\354\240\225\353\240\254\355\225\230\352\270\260.java" "b/T3-\354\204\261\355\230\204/2750 \354\230\244\353\246\204\354\260\250\354\210\230\354\240\225\353\240\254\355\225\230\352\270\260.java"
new file mode 100644
index 0000000..8d968ff
--- /dev/null
+++ "b/T3-\354\204\261\355\230\204/2750 \354\230\244\353\246\204\354\260\250\354\210\230\354\240\225\353\240\254\355\225\230\352\270\260.java"	
@@ -0,0 +1,27 @@
+import java.util.Scanner;
+import java.util.Arrays; //java How Default Arrays function implement array?
+
+class Main {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        int n=sc.nextInt();
+        int a[]=new int[n];
+        for(int i=0;i<n;i++){
+            int b=sc.nextInt();
+            a[i]=b;
+        }
+        for(int i=0;i<n-1;i++){
+            for(int j=0;j<n-1-i;j++){
+                if(a[j]>a[j+1]){
+                    int temp;
+                    temp=a[j];
+                    a[j]=a[j+1];
+                    a[j+1]=temp;
+                }
+            }
+        }
+        for(int i:a){
+            System.out.println(i);
+        }
+    }
+}
diff --git "a/T3-\354\204\261\355\230\204/2750.java" "b/T3-\354\204\261\355\230\204/2750.java"
new file mode 100644
index 0000000..002d18a
--- /dev/null
+++ "b/T3-\354\204\261\355\230\204/2750.java"
@@ -0,0 +1,43 @@
+#include <iostream>
+#include <queue>
+#include <vector>
+#include <cmath>
+using namespace std;
+struct smp{
+    bool operator()(int a,int b) {
+        if(abs(a)==abs(b))
+            return a>b;
+        return abs(a)>abs(b);
+    }
+    };
+int main() {
+        int n,x;
+        priority_queue<int,vector<int>,cmp> q;
+        vector<int> v;
+        cin >> n;
+
+        for (int i=0;i<n;i++) {
+            cin >> x;
+            if(x==0){
+                if(q.empty()){
+                    v.push_back(0);
+                    }else{
+                        v.push_back(q.top());
+                        q.pop();
+                        }
+                }else {
+                    q.push(x);
+                    }
+            }
+        for (int i=0;i<v.size();i++) {
+            cout<<v[i]<<'\n';
+        
+            }
+        return 0;
+    }
+
+#If not use class,
+
+#Bubble sort
+        #team sort
+        #Counting sort
\ No newline at end of file
diff --git "a/T3-\354\204\261\355\230\204/11286.py" "b/T3-\354\204\261\355\230\204/Priority Queue11286.py"
similarity index 97%
rename from "T3-\354\204\261\355\230\204/11286.py"
rename to "T3-\354\204\261\355\230\204/Priority Queue11286.py"
index db2f8cc..e3e9a20 100644
--- "a/T3-\354\204\261\355\230\204/11286.py"
+++ "b/T3-\354\204\261\355\230\204/Priority Queue11286.py"	
@@ -35,3 +35,5 @@
             }
         return 0;
     }
+
+#If not use class,
diff --git "a/T3-\354\204\261\355\230\204/Sorting Algorithm Timsort.py" "b/T3-\354\204\261\355\230\204/Sorting Algorithm Timsort.py"
new file mode 100644
index 0000000..d87eb01
--- /dev/null
+++ "b/T3-\354\204\261\355\230\204/Sorting Algorithm Timsort.py"	
@@ -0,0 +1,49 @@
+a=[2,5,1,9,7]
+b="zbdaf"
+c=['ccc','aaaa','d','bb']]
+d=['cde','cfc','abc']
+sorted(a,b)
+"".join(sorted(b))
+
+sorted(c, key=len)
+
+sorted(c, key=x;x[1])
+
+
+
+def fn(s):
+    return s[0],s[-1]
+
+print(sorted(d,key=fn))
+sorted(d,key=lambda s:(s[0],s[-1]))
+
+#Example problemLeetcode 49 Group Anagrams
+def groupAnagrams(self,strs:List[str])->List[List[str]]:
+    anagrams=collections.defaultdict(list)
+
+    for word in strs:
+        anagrams[''.join(sorted(word))].append(word)
+    return list(anagrams.values())
+
+
+
+
+#History John von Neumann Merge Sort     O(n log n)
+#quick sort, Mergesort, Timsort
+
+
+#sorted by Timsort timsort.c python.c
+
+"""
+Chapter 51
+Optimistic Sorting and Information Theoretic Complexity
+Peter McIlroy
+
+
+Timsort
+
+
+Joshua Bloch
+Java Array, sort()
+
+"""