feat(02-nondupl): Добавлено задание

labs/02-nondupl/app/build.gradle.kts

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+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.10.2/userguide/building_java_projects.html in the Gradle documentation.
+ */
+
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    application
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // This dependency is used by the application.
+    implementation(libs.guava)
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(23)
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = "ru.mrqiz.nondupl.App"
+}
+
+tasks.named<Test>("test") {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+}
+
+tasks.named<JavaExec>("run") {
+   standardInput = System.`in`
+}
+

labs/02-nondupl/app/src/main/java/ru/mrqiz/nondupl/App.java

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+package ru.mrqiz.nondupl;
+
+import java.util.HashMap;
+
+public class App {
+  public static void main(String[] args) {
+    HashMap<Integer, Integer> map = new HashMap<>();
+    
+    for (String arg : args) {
+      if (!arg.matches("-?\\d+")) {
+        System.err.println("Not int found, skipping " + arg);
+      } else {
+        Integer i = Integer.valueOf(arg);
+        map.put(i, map.getOrDefault(i, 0) + 1);
+      }
+    }
+    
+    for (Integer number : map.keySet()) {
+      if (map.get(number) == 1) {
+        System.out.println(number);
+      }
+    }
+  }
+}