[20250830] BOJ / G5 / 탑 / 김민진

zinnnn37/202508/30 BOJ G5 탑.md

@@ -0,0 +1,60 @@
+```java
+import java.io.*;
+import java.util.Stack;
+import java.util.StringTokenizer;
+
+public class BJ_2493_탑 {
+
+	private static final BufferedReader  br = new BufferedReader(new InputStreamReader(System.in));
+	private static final BufferedWriter  bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	private static final StringBuilder   sb = new StringBuilder();
+	private static       StringTokenizer st;
+
+	private static int   N;
+	private static int[] height;
+
+	private static Stack<Integer> s;
+
+	public static void main(String[] args) throws IOException {
+		init();
+		sol();
+	}
+
+	private static void init() throws IOException {
+		N = Integer.parseInt(br.readLine());
+
+		height = new int[N];
+		st     = new StringTokenizer(br.readLine());
+		for (int i = 0; i < N; i++) {
+			height[i] = Integer.parseInt(st.nextToken());
+		}
+
+		s = new Stack<>();
+		s.push(0);
+		sb.append("0 ");
+
+		br.close();
+	}
+
+	private static void sol() throws IOException {
+		for (int i = 1; i < N; i++) {
+			// 현재 건물보다 높이가 높은 건물이 나올 때 까지 pop
+			while (!s.isEmpty() && height[s.peek()] < height[i]) {
+				s.pop();
+			}
+
+			// 왼쪽에 현재 건물보다 높은 건물 부재
+			if (s.isEmpty()) {
+				sb.append("0 ");
+			} else {
+				sb.append(s.peek() + 1).append(" ");
+			}
+			s.push(i);
+		}
+		bw.write(sb.toString());
+		bw.flush();
+		bw.close();
+	}
+
+}
+```