diff --git "a/EunjiShin/PS/programmers/355円225円264円354円213円234円/354円231円204円354円243円274円355円225円230円354円247円200円 353円252円273円355円225円234円 354円204円240円354円210円230円.java" "b/EunjiShin/PS/programmers/355円225円264円354円213円234円/354円231円204円354円243円274円355円225円230円354円247円200円 353円252円273円355円225円234円 354円204円240円354円210円230円.java"
new file mode 100644
index 0000000..3b502d2
--- /dev/null
+++ "b/EunjiShin/PS/programmers/355円225円264円354円213円234円/354円231円204円354円243円274円355円225円230円354円247円200円 353円252円273円355円225円234円 354円204円240円354円210円230円.java"	
@@ -0,0 +1,24 @@
+import java.util.*;
+
+class Solution {
+ public String solution(String[] participant, String[] completion) {
+ String answer = "";
+ Map<string, Integer> map = new HashMap<strong>();
+ 
+ for(String str : participant){
+ map.put(str, map.getOrDefault(str, 0)+1);
+ }
+ 
+ for(String str : completion){
+ map.put(str, map.get(str)-1);
+ }
+ 
+ for(String key : map.keySet()){
+ if(map.get(key) == 1){
+ answer = key;
+ }
+ }
+ 
+ return answer;
+ }
+}
\ No newline at end of file
diff --git "a/EunjiShin/PS/programmers/355円225円264円354円213円234円/354円240円204円355円231円224円353円262円210円355円230円270円 353円252円251円353円241円235円.java" "b/EunjiShin/PS/programmers/355円225円264円354円213円234円/354円240円204円355円231円224円353円262円210円355円230円270円 353円252円251円353円241円235円.java"
new file mode 100644
index 0000000..eeb3ea6
--- /dev/null
+++ "b/EunjiShin/PS/programmers/355円225円264円354円213円234円/354円240円204円355円231円224円353円262円210円355円230円270円 353円252円251円353円241円235円.java"	
@@ -0,0 +1,33 @@
+import java.util.*;
+
+class Solution {
+ public boolean solution(String[] phone_book) {
+ boolean answer = true;
+ Map<string, String> map = new HashMap<strong>();
+ 
+ Arrays.sort(phone_book);
+ for(String phone_number : phone_book){
+ map.put(phone_number, "1");
+ }
+ 
+ for(String phone_number : phone_book){
+ for(int i=0; i<phone_number.length(); i++){
+ String str = phone_number.substring(0, i);
+ if(map.containsKey(str)){
+ return false;
+ }
+ }
+ }
+
+ // Hash없이 푼다면 startsWith
+ // Arrays.sort(phone_book);
+ // for (int i=0; i<phone_book.length-1; i++) {
+ // if (phone_book[i+1].startsWith(phone_book[i])) {
+ // answer = false;
+ // break;
+ // }
+ // }
+ 
+ return answer;
+ }
+}
\ No newline at end of file
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://patch-diff.githubusercontent.com/raw/TecheerB/Java_Algorithm/pull/10.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://patch-diff.githubusercontent.com/raw/TecheerB/Java_Algorithm/pull/10.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>