2 files changed, 142 insertions, 0 deletions
diff --git a/src/main/NetworkPacket.java b/src/main/NetworkPacket.java
new file mode 100644
index 0000000..805dcf5
--- /dev/null
+++ b/src/main/NetworkPacket.java
@@ -0,0 +1,83 @@
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class NetworkPacket {
+
+    public static class Request {
+        public int arrivalTime;
+        public int processTime;
+
+        public Request(int arrivalTime, int processTime) {
+            this.arrivalTime = arrivalTime;
+            this.processTime = processTime;
+        }
+
+    }
+
+    public static class Response {
+        public boolean dropped;
+        public int startTime;
+
+        public Response(boolean dropped, int startTime) {
+            this.dropped = dropped;
+            this.startTime = startTime;
+        }
+    }
+
+    public static class Buffer {
+        private int size;
+        private ArrayList<Integer> finishTime = new ArrayList<Integer>();
+
+        public Buffer(int size) {
+            this.size = size;
+        }
+        public Response processRequests(Request request) {
+            // write your code here
+            if (this.size == 0)
+            return new Response(false,-1);
+            else {
+                if (finishTime.size() == 0)
+            }
+        }
+    }
+    private static ArrayList<Request> ReadQueries(Scanner scanner) throws IOException {
+        int requests_count = scanner.nextInt();
+        ArrayList<Request> requests = new ArrayList<Request>();
+        for (int i = 0; i < requests_count; ++i) {
+            int arrival_time = scanner.nextInt();
+            int process_time = scanner.nextInt();
+            requests.add(new Request(arrival_time, process_time));
+        }
+        return requests;
+    }
+
+    public static ArrayList<Response> processRequests(ArrayList<Request> requests, Buffer buf) {
+        ArrayList<Response> responses = new ArrayList<>();
+        for (int i = 0; i < requests.size(); i++) {
+           responses.add(buf.processRequests(requests.get(i)));
+        }
+        return responses;
+    }
+    private static void PrintResponses(ArrayList<Response> responses) {
+        for (int i = 0; i < responses.size(); ++i) {
+            Response response = responses.get(i);
+            if (response.dropped) {
+                System.out.println(-1);
+            } else {
+                System.out.println(response.startTime);
+            }
+        }
+    }
+
+    public static void main(String[] args) throws IOException {
+        Scanner scanner = new Scanner(System.in);
+
+        int buffer_max_size = scanner.nextInt();
+        Buffer buffer = new Buffer(buffer_max_size);
+
+        ArrayList<Request> requests = ReadQueries(scanner);
+        ArrayList<Response> responses = processRequests(requests, buffer);
+        PrintResponses(responses);
+    }
+}
diff --git a/src/test/NetworkPacketTest.java b/src/test/NetworkPacketTest.java
new file mode 100644
index 0000000..fca3d60
--- /dev/null
+++ b/src/test/NetworkPacketTest.java
@@ -0,0 +1,59 @@
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class NetworkPacketTest {
+    @Test
+    void test() {
+        int bufferMaxSize = 1;
+        NetworkPacket.Buffer buf = new NetworkPacket.Buffer(bufferMaxSize);
+        ArrayList<NetworkPacket.Request> requests = new ArrayList<>();
+        ArrayList<NetworkPacket.Response> responses = NetworkPacket.processRequests(requests, buf);
+        assertEquals(0, responses.size());
+    }
+
+    @Test
+    void test1() {
+        int bufferMaxSize = 1;
+        NetworkPacket.Buffer buf = new NetworkPacket.Buffer(bufferMaxSize);
+        ArrayList<NetworkPacket.Request> requests = new ArrayList<>();
+        requests.add(new NetworkPacket.Request(0, 1));
+        ArrayList<NetworkPacket.Response> responses = NetworkPacket.processRequests(requests, buf);
+        assertEquals(1, responses.size());
+        assertFalse(responses.get(0).dropped);
+        assertEquals(0, responses.get(0).startTime);
+    }
+
+    @Test
+    void test2() {
+        int bufferMaxSize = 1;
+        NetworkPacket.Buffer buf = new NetworkPacket.Buffer(bufferMaxSize);
+        ArrayList<NetworkPacket.Request> requests = new ArrayList<>();
+        requests.add(new NetworkPacket.Request(0, 1));
+        requests.add(new NetworkPacket.Request(0, 1));
+        ArrayList<NetworkPacket.Response> responses = NetworkPacket.processRequests(requests, buf);
+        assertEquals(2, responses.size());
+        assertFalse(responses.get(0).dropped);
+        assertEquals(0, responses.get(0).startTime);
+        assertTrue(responses.get(1).dropped);
+    }
+
+    @Test
+    void test3() {
+        int bufferMaxSize = 1;
+        NetworkPacket.Buffer buf = new NetworkPacket.Buffer(bufferMaxSize);
+        ArrayList<NetworkPacket.Request> requests = new ArrayList<>();
+        requests.add(new NetworkPacket.Request(0, 1));
+        requests.add(new NetworkPacket.Request(1, 1));
+        ArrayList<NetworkPacket.Response> responses = NetworkPacket.processRequests(requests, buf);
+        assertEquals(2, responses.size());
+        assertFalse(responses.get(0).dropped);
+        assertEquals(0, responses.get(0).startTime);
+        assertFalse(responses.get(1).dropped);
+        assertEquals(1, responses.get(1).startTime);
+    }
+}