[20251022] BOJ / G3 / 난개발 / 한종욱

Ukj0ng/202510/22 BOJ G3 난개발.md

@@ -0,0 +1,75 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static List<int[]> events;
+    private static int[][] points, traffic;
+    private static int N, M;
+    public static void main(String[] args) throws IOException {
+        init();
+        long answer = sweep();
+
+        bw.write(answer + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+
+        events = new ArrayList<>();
+        points = new int[N+1][2];
+        traffic = new int[M][3];
+
+        for (int i = 1; i <= N; i++) {
+            st = new StringTokenizer(br.readLine());
+            points[i][0] = Integer.parseInt(st.nextToken());
+            points[i][1] = Integer.parseInt(st.nextToken());
+        }
+
+        for (int i = 0; i < M; i++) {
+            st = new StringTokenizer(br.readLine());
+            int u = Integer.parseInt(st.nextToken());
+            int v = Integer.parseInt(st.nextToken());
+            int c = Integer.parseInt(st.nextToken());
+
+            traffic[i][0] = Math.min(points[u][1], points[v][1]);
+            traffic[i][1] = Math.max(points[u][1], points[v][1]);
+            traffic[i][2] = c;
+        }
+
+        Arrays.sort(traffic, (o1, o2) -> {
+            if (o1[0] == o2[0]) return Integer.compare(o1[1], o2[1]);
+            return Integer.compare(o1[0], o2[0]);
+        });
+
+        for (int[] t : traffic) {
+            events.add(new int[]{t[0], t[2], 1});
+            events.add(new int[]{t[1]+1, t[2], -1});
+        }
+
+        events.sort((o1, o2) -> {
+            if (o1[0] != o2[0]) return Integer.compare(o1[0], o2[0]);
+            return Integer.compare(o1[2], o2[2]);
+        });
+    }
+
+    private static long sweep() {
+        long result = 0;
+        long current= 0;
+
+        for (int[] e : events) {
+            current += (long)e[1]*e[2];
+            result = Math.max(result, current);
+        }
+
+        return result;
+    }
+}
+```