uploaded at 2022. 12. 18. 오전 12:19:04

programmers/숫자 짝꿍/solution.java

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+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/131128
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+class Solution {
+    public String solution(String X, String Y) {
+        String answer = "";
+        LinkedList<Integer> an = new LinkedList<>();
+        HashMap<Integer, Integer> hash = new HashMap<>();
+        HashMap<Integer, Integer> hash2 = new HashMap<>();
+        char[] yy = Y.toCharArray();
+        char[] xx = X.toCharArray();
+        for(char cy : yy){
+            int nn = Character.getNumericValue(cy);
+            hash.put(nn,hash.getOrDefault(nn,0)+1);
+        }
+        for(char cx : xx){
+            int nn = Character.getNumericValue(cx);
+            hash2.put(nn,hash2.getOrDefault(nn,0)+1);
+        }
+        for(Integer key : hash.keySet()){
+            if(hash2.getOrDefault(key,0)==0) continue;
+            Integer count = Math.min(hash.get(key),hash2.get(key));
+            for(int oo = 0; oo < count; oo++)
+            an.add(key);
+        }
+        Object[] ans = an.toArray();
+        answer = Arrays.stream(ans).map(String::valueOf).sorted(Comparator.reverseOrder()).collect(Collectors.joining());
+        answer = (answer.equals(""))? "-1" : answer;
+        answer = (answer.matches("^0+")) ? "0" : answer;
+        return answer;
+    }
+}