[20250802] BOJ / G3 / 오등큰수 / 이강현

lkhyun/202508/02 BOJ G3 오등큰수.md

@@ -0,0 +1,46 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static int[] arr;
+    static Map<Integer,Integer> count;
+    static int[] NGF;
+
+    public static void main(String[] args) throws Exception {
+        int N = Integer.parseInt(br.readLine());
+        arr = new int[N];
+        count = new HashMap<>();
+        st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < N; i++) {
+            arr[i] = Integer.parseInt(st.nextToken());
+            count.put(arr[i], count.getOrDefault(arr[i], 0)+1);
+        }
+        if(N == 1){
+            bw.write("-1");
+            bw.close();
+            return;
+        }
+
+        NGF = new int[N];
+        ArrayDeque<Integer> stk = new ArrayDeque<>();
+        stk.push(0);
+        for (int i = 1; i < N; i++) {
+            while(!stk.isEmpty() && count.get(arr[stk.peek()])<count.get(arr[i])){
+                NGF[stk.poll()] = arr[i];
+            }
+            stk.push(i);
+        }
+        while(!stk.isEmpty()){
+            NGF[stk.poll()] = -1;
+        }
+        for (int i = 0; i < N; i++) {
+            bw.write(NGF[i]+" ");
+        }
+        bw.close();
+    }
+}
+```