From 1d6b261b372235db6129b89f7826437a0dc6fda8 Mon Sep 17 00:00:00 2001
From: Liveenjuck <vipkukov5@gmail.com>
Date: Tue, 2 Dec 2025 17:02:08 +0500
Subject: [PATCH 1/4] task01 solve

---
 task01/src/com/example/task01/Task01Main.java | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/task01/src/com/example/task01/Task01Main.java b/task01/src/com/example/task01/Task01Main.java
index 7efef9a8..c388ff31 100644
--- a/task01/src/com/example/task01/Task01Main.java
+++ b/task01/src/com/example/task01/Task01Main.java
@@ -1,5 +1,6 @@
 package com.example.task01;
 
+import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
@@ -8,14 +9,17 @@ public static void main(String[] args) throws IOException {
         //здесь вы можете вручную протестировать ваше решение, вызывая реализуемый метод и смотря результат
         // например вот так:
 
-        /*
+
         System.out.println(checkSumOfStream(new ByteArrayInputStream(new byte[]{0x33, 0x45, 0x01})));
-        */
 
     }
 
     public static int checkSumOfStream(InputStream inputStream) throws IOException {
-        // your implementation here
-        return 0;
+        if (inputStream == null) throw new IllegalArgumentException();
+        int curByte, checkSum = 0;
+        while ((curByte = inputStream.read()) != -1) {
+            checkSum = Integer.rotateLeft(checkSum, 1) ^ curByte;
+        }
+        return checkSum;
     }
-}
+}
\ No newline at end of file

From 5acd95508e4ab8facebdc7ba462816cd2efee962 Mon Sep 17 00:00:00 2001
From: Liveenjuck <vipkukov5@gmail.com>
Date: Tue, 2 Dec 2025 17:46:36 +0500
Subject: [PATCH 2/4] task02 solve

---
 task02/src/com/example/task02/Task02Main.java | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/task02/src/com/example/task02/Task02Main.java b/task02/src/com/example/task02/Task02Main.java
index 865ea659..bc04adac 100644
--- a/task02/src/com/example/task02/Task02Main.java
+++ b/task02/src/com/example/task02/Task02Main.java
@@ -9,5 +9,30 @@ public static void main(String[] args) throws IOException {
         // - направить стандартный вывод программы в файл output.test
         // - запустить программу
         // - и сравнить получившийся файл output.test с expected.test
+        int currentByte;
+        boolean lastWasCarriageReturn = false;
+        while((currentByte = System.in.read()) != -1) {
+            if (currentByte == 13) {
+                if (lastWasCarriageReturn) System.out.write(13);
+                lastWasCarriageReturn = true;
+            }
+            else if (currentByte == 10) {
+                if (lastWasCarriageReturn) {
+                    System.out.write(10);
+                    lastWasCarriageReturn = false;
+                }
+                else System.out.write(10);
+            }
+            else {
+                if (lastWasCarriageReturn) {
+                    System.out.write(13);
+                    lastWasCarriageReturn= false;
+                }
+                System.out.write(currentByte);
+            }
+        }
+
+        if (lastWasCarriageReturn) System.out.write(13);
+        System.out.flush();
     }
 }

From eb1b05e4cea254640f239c0a95d97854f8931770 Mon Sep 17 00:00:00 2001
From: Liveenjuck <vipkukov5@gmail.com>
Date: Tue, 2 Dec 2025 19:25:03 +0500
Subject: [PATCH 3/4] task03 solve

---
 task03/src/com/example/task03/Task03Main.java | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/task03/src/com/example/task03/Task03Main.java b/task03/src/com/example/task03/Task03Main.java
index 332e0366..fe54dba1 100644
--- a/task03/src/com/example/task03/Task03Main.java
+++ b/task03/src/com/example/task03/Task03Main.java
@@ -1,7 +1,6 @@
 package com.example.task03;
 
-import java.io.IOException;
-import java.io.InputStream;
+import java.io.*;
 import java.nio.charset.Charset;
 
 public class Task03Main {
@@ -15,7 +14,14 @@ public static void main(String[] args) throws IOException {
     }
 
     public static String readAsString(InputStream inputStream, Charset charset) throws IOException {
-        // your implementation here
-        return "";
+        if (inputStream == null || charset == null) throw new IllegalArgumentException();
+        InputStreamReader reader = new InputStreamReader(inputStream, charset);
+        BufferedReader bufReader = new BufferedReader(reader);
+        StringBuilder res = new StringBuilder();
+        String line;
+        while ((line = bufReader.readLine()) != null) {
+            res.append(line);
+        }
+        return res.toString();
     }
 }

From 2ba7e30ca5ed3967b1317daa30762b534b55eb8b Mon Sep 17 00:00:00 2001
From: Liveenjuck <vipkukov5@gmail.com>
Date: Tue, 2 Dec 2025 19:44:20 +0500
Subject: [PATCH 4/4] task04 solve

---
 task04/src/com/example/task04/Task04Main.java | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/task04/src/com/example/task04/Task04Main.java b/task04/src/com/example/task04/Task04Main.java
index 4236c2e7..5e988cbd 100644
--- a/task04/src/com/example/task04/Task04Main.java
+++ b/task04/src/com/example/task04/Task04Main.java
@@ -1,6 +1,8 @@
 package com.example.task04;
 
 import java.io.IOException;
+import java.util.Scanner;
+import java.util.Locale;
 
 public class Task04Main {
     public static void main(String[] args) throws IOException {
@@ -9,6 +11,13 @@ public static void main(String[] args) throws IOException {
         // - запустить программу
         // - проверить, что получилось 351.731900
 
-        System.out.println("0.0");
+        Scanner scanner = new Scanner(System.in).useLocale(Locale.US);
+        double sum = 0d;
+        while (scanner.hasNext()) {
+            if (scanner.hasNextDouble()) sum += scanner.nextDouble();
+            else scanner.next();
+        }
+        System.out.printf(Locale.US, "%.6f", sum);
+        scanner.close();
     }
 }