top-k-frequent-elements solution

Author: hancrysta1

top-k-frequent-elements/sj.java

@@ -0,0 +1,17 @@
+import java.util.*;
+class Solution {
+    public int[] topKFrequent(int[] nums, int k) {
+        Map<Integer,Integer> count = new HashMap<>();
+        for(int i=0;i<nums.length;i++){
+            count.put(nums[i],count.getOrDefault(nums[i],0)+1);
+        }
+        List<Integer> sortedCount = new ArrayList<>(count.keySet());
+        sortedCount.sort((a,b)->count.get(b)-count.get(a));//value 기준 키 정렬
+        int[] answer = new int[k];
+        for(int i=0;i<k;i++){
+            answer[i] = sortedCount.get(i);
+        }
+        
+        return answer;
+    }
+}