diff --git "a/eunbi/week15/\353\241\244\354\274\200\354\235\264\355\201\254\354\236\220\353\245\264\352\270\260.java" "b/eunbi/week15/\353\241\244\354\274\200\354\235\264\355\201\254\354\236\220\353\245\264\352\270\260.java"
new file mode 100644
index 0000000..e0ec469
--- /dev/null
+++ "b/eunbi/week15/\353\241\244\354\274\200\354\235\264\355\201\254\354\236\220\353\245\264\352\270\260.java"
@@ -0,0 +1,29 @@
+package algorithmStudy;
+
+import java.util.*;
+
+class Solution {
+    public int solution(int[] topping) {
+        int answer = 0;
+        Map<Integer, Integer> map1 = new HashMap<Integer, Integer>();
+        Map<Integer, Integer> map2 = new HashMap<Integer, Integer>();
+        
+        for(int i : topping)
+            map1.put(i, map1.getOrDefault(i, 0) + 1);
+        
+        for(int i=0; i<topping.length-1; i++){
+            if(map1.containsKey(topping[i]) && map1.get(topping[i])>0)
+                map1.put(topping[i], map1.get(topping[i]) - 1);
+            
+            if(map1.get(topping[i])==0)
+                map1.remove(topping[i]);
+            
+            map2.put(topping[i], map2.getOrDefault(topping[i], 0) + 1);
+            
+            if(map1.size()==map2.size())
+                answer++;            
+        }
+        
+        return answer;
+    }
+}
\ No newline at end of file
diff --git "a/eunbi/week15/\353\260\251\352\270\210\352\267\270\352\263\241.java" "b/eunbi/week15/\353\260\251\352\270\210\352\267\270\352\263\241.java"
new file mode 100644
index 0000000..c9859ea
--- /dev/null
+++ "b/eunbi/week15/\353\260\251\352\270\210\352\267\270\352\263\241.java"
@@ -0,0 +1,81 @@
+package algorithmStudy;
+
+import java.util.*;
+
+public class Music{
+    private int music_len_ = 0;       // À½¾Ç Àç»ý ½Ã°£
+    private String melody_ = "";      // Àç»ýµÈ ¸á·Îµð
+    private String title_ = "";       // ³ë·¡ Á¦¸ñ
+    private boolean flag_ = false;    // Á¶°Ç ¸¸Á· : true, ¸¸Á· x : false
+    
+    public Music(String[] s){
+        title_ = s[2];
+        music_len_ = Integer.parseInt(s[1].substring(3, 5)) - Integer.parseInt(s[0].substring(3, 5)) + 60*(Integer.parseInt(s[1].substring(0, 2)) - Integer.parseInt(s[0].substring(0, 2)));
+    }
+    
+    public void set_melody(String melody){ // Àç»ýµÈ ¸á·Îµð °è»ê
+        melody_ = melody;
+    }
+    
+    public int get_music_len(){
+        return music_len_;
+    }
+
+    public void set_flag(String m){
+        flag_ = melody_.contains(m);
+    }
+    
+    public boolean get_flag(){
+        return flag_;
+    }
+    
+    public String get_title(){
+        return title_;
+    }
+}
+
+class Solution {
+    public String solution(String m, String[] musicinfos) {
+        String answer = "(None)";
+        int max_len = 0;
+        Music[] music = new Music[musicinfos.length];
+        m = convert(m.replace("#", "").length() ,m);
+        
+        for(int i=0; i<musicinfos.length; i++){
+            music[i] = new Music(musicinfos[i].split(","));
+            music[i].set_melody(convert(music[i].get_music_len(), musicinfos[i].split(",")[3]));
+            music[i].set_flag(m);
+        }
+        
+        for(int i=0; i<music.length; i++){
+            if(music[i].get_flag() && max_len < music[i].get_music_len()){
+                answer = music[i].get_title();
+                max_len = music[i].get_music_len();
+            }
+        }
+        
+        return answer;
+    }
+    
+    public String convert(int len, String melody){ // #À» ¼Ò¹®ÀÚ·Î º¯°æ(contains ÀÌ¿ëÀ» À§ÇØ)
+        String s = "";
+        int j=0;
+
+        for(int i=0; i<len; i++){ 
+            if(j<melody.length()-1 && melody.charAt(j+1)=='#'){
+                s += Character.toLowerCase(melody.charAt(j));
+                len++;
+            }
+            else if(melody.charAt(j)=='#')
+                s += "";
+            else
+                s += melody.charAt(j);
+            j++;
+            if((i+1)%melody.length()==0)
+                j=0;  
+        }
+        
+        return s;
+    }
+    
+}
diff --git "a/eunbi/week15/\354\240\225\354\210\230\354\202\274\352\260\201\355\230\225.java" "b/eunbi/week15/\354\240\225\354\210\230\354\202\274\352\260\201\355\230\225.java"
new file mode 100644
index 0000000..8b0a95d
--- /dev/null
+++ "b/eunbi/week15/\354\240\225\354\210\230\354\202\274\352\260\201\355\230\225.java"
@@ -0,0 +1,25 @@
+package algorithmStudy;
+
+import java.util.*;
+
+class Solution {
+    public int solution(int[][] triangle) {
+        int answer = 0;
+        
+        for(int i=1; i<triangle.length; i++){
+            for(int j=0; j<triangle[i].length; j++){
+                if(j==0)
+                    triangle[i][j] += triangle[i-1][j];
+                else if(j==triangle[i].length-1)
+                    triangle[i][j] += triangle[i-1][j-1];
+                else
+                    triangle[i][j] += Math.max(triangle[i-1][j], triangle[i-1][j-1]);
+            }
+        }
+        
+        for(int i : triangle[triangle.length-1])
+            answer = Math.max(answer, i);
+        
+        return answer;
+    }
+}