[20251016] BOJ / G1 / 택배 / 김민진

Author: zinnnn37

zinnnn37/202510/16 BOJ G1 택배.md

@@ -0,0 +1,100 @@
+```java
+import java.io.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.StringTokenizer;
+
+public class BJ_8980_택배 {
+
+	private static final BufferedReader  br = new BufferedReader(new InputStreamReader(System.in));
+	private static final BufferedWriter  bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	private static       StringTokenizer st;
+
+	private static int N, C, M, delivered, loaded;
+	private static int[]        packageLoaded;
+	private static List<Node>[] graph;
+
+	private static class Node implements Comparable<Node> {
+		int to;
+		int packages;
+
+		Node(int to, int packages) {
+			this.to = to;
+			this.packages = packages;
+		}
+
+		@Override
+		public int compareTo(Node o) {
+			return Integer.compare(this.to, o.to);
+		}
+	}
+
+	public static void main(String[] args) throws IOException {
+		init();
+		sol();
+	}
+
+	private static void init() throws IOException {
+		st = new StringTokenizer(br.readLine());
+
+		N = Integer.parseInt(st.nextToken());
+		C = Integer.parseInt(st.nextToken());
+		M = Integer.parseInt(br.readLine());
+
+		packageLoaded = new int[N + 1];
+
+		graph = new List[N + 1];
+		for (int i = 1; i <= N; i++) {
+			graph[i] = new ArrayList<>();
+		}
+
+		for (int i = 0; i < M; i++) {
+			st = new StringTokenizer(br.readLine());
+
+			int from     = Integer.parseInt(st.nextToken());
+			int to       = Integer.parseInt(st.nextToken());
+			int packages = Integer.parseInt(st.nextToken());
+
+			graph[from].add(new Node(to, packages));
+		}
+
+		for (int i = 1; i <= N; i++) {
+			Collections.sort(graph[i]);
+		}
+	}
+
+	private static void sol() throws IOException {
+		for (int i = 1; i <= N; i++) {
+			delivered += packageLoaded[i];
+			loaded -= packageLoaded[i];
+
+			for (int j = 0; j < graph[i].size(); j++) {
+				Node cur = graph[i].get(j);
+
+				if (loaded + cur.packages <= C) {
+					loaded += cur.packages;
+					packageLoaded[cur.to] += cur.packages;
+				} else {
+					int left = cur.packages - (C - loaded);
+					for (int k = N; k >= cur.to; k--) {
+						int diff = Math.min(left, packageLoaded[k]);
+
+						packageLoaded[k] -= diff;
+						left -= diff;
+						loaded += diff;
+
+						if (left == 0) break;
+					}
+					packageLoaded[cur.to] += cur.packages - left;
+				}
+			}
+		}
+		bw.write(delivered + "");
+		bw.flush();
+		bw.close();
+		br.close();
+	}
+
+}
+```