[20251224] BOJ / G3 / 가장높은탑쌓기 / 한종욱

Author: Ukj0ng

Ukj0ng/202512/24 BOJ G3 가장높은탑쌓기.md

@@ -0,0 +1,69 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static Deque<Integer> deque = new ArrayDeque<>();
+    private static int[][] towers;
+    private static int[] dp, history;
+    private static int N;
+
+    public static void main(String[] args) throws IOException {
+        init();
+
+        bw.write(deque.size() + "\n");
+        while (!deque.isEmpty()) {
+            bw.write(deque.pollFirst() + "\n");
+        }
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        N = Integer.parseInt(br.readLine());
+        towers = new int[N][4];
+        dp = new int[N];
+        history = new int[N];
+
+        Arrays.fill(history, -1);
+
+        int len = 0;
+        int index = -1;
+
+        for (int i = 0; i < N; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            towers[i][0] = Integer.parseInt(st.nextToken());
+            towers[i][1] = Integer.parseInt(st.nextToken());
+            towers[i][2] = Integer.parseInt(st.nextToken());
+            towers[i][3] = i + 1;
+        }
+
+        Arrays.sort(towers, (o1, o2) -> Integer.compare(o2[0], o1[0]));
+
+        for (int i = 0; i < N; i++) {
+            dp[i] = towers[i][1];
+
+            for (int j = 0; j < i; j++) {
+                if (towers[j][2] > towers[i][2]) {
+                    if (dp[j] + towers[i][1] > dp[i]) {
+                        dp[i] = dp[j] + towers[i][1];
+                        history[i] = j;
+                    }
+                }
+            }
+            if (dp[i] > len) {
+                len = dp[i];
+                index = i;
+            }
+        }
+
+        while (index != -1) {
+            deque.addLast(towers[index][3]);
+            index = history[index];
+        }
+    }
+}
+```