diff --git a/programmers/실패율/solution.java b/programmers/실패율/solution.java
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+++ b/programmers/실패율/solution.java
@@ -0,0 +1,30 @@
+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/42889
+
+import java.util.*;
+import java.lang.*;
+import java.util.stream.Collectors;
+
+class Solution {
+    private double lossLate(int a, int[] stages){
+        int total = 0;
+        int aa = 0;
+        for(int b : stages){
+            if(b>=a) total += 1;
+            if(b == a) aa += 1;
+        }
+        return (aa != 0) ? (double) aa / total : 0;
+    }
+    public int[] solution(int N, int[] stages) {
+        int[] answer = new int[N];
+        Integer istages[] = Arrays.stream(stages).boxed().toArray(Integer[]::new); 
+        HashMap<Integer, Double> results = new HashMap<>();
+        for (int c = 1; c <= N; c++) results.put(c,lossLate(c,stages));
+        List<Map.Entry<Integer, Double>> rlist = results.entrySet().stream()
+                .sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
+                .collect(Collectors.toList());
+        int cc = 0;
+        System.out.println(rlist);
+        for(Map.Entry<Integer, Double> rs : rlist) answer[cc++] = rs.getKey();
+        return answer;
+    }
+}
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