Merge pull request #1625 from AlgorithmWithGod/LiiNi-coder

[20251209] PGM / LV2 / 할인 행사 / 이인희

Author: ShinHeeEul

LiiNi-coder/202512/09 PGM 할인 행사.md

@@ -0,0 +1,48 @@
+```java
+import java.util.*;
+
+class Solution {
+    private static HashMap<String, Integer> wordsIndex;
+
+    public int solution(String[] wants, int[] number, String[] discounts) {
+        int answer = 0;
+        wordsIndex = new HashMap<String, Integer>();
+        int i = 0;
+        for(String want : wants){
+            wordsIndex.put(want, i++);
+        }
+        int[] counts = new int[wants.length];
+        
+        ArrayDeque<String> q = new ArrayDeque<String>();
+        String polled;
+        for(String discount : discounts){
+            if(wordsIndex.containsKey(discount)){
+                counts[wordsIndex.get(discount)]++;
+            }
+            q.offer(discount);
+            if(q.size() > 10){
+                polled = q.poll();
+                if(wordsIndex.containsKey(polled)){
+                    counts[wordsIndex.get(polled)]--;
+                }
+            }
+
+            if(q.size() == 10){
+                boolean ok = true;
+                for(int k=0; k<number.length; k++){
+                    if(counts[k] < number[k]){
+                        ok = false;
+                        break;
+                    }
+                }
+                if(ok){
+                    answer++;
+                }
+            }
+        }
+
+        return answer;
+    }
+}
+
+```