answer:Here's an example of how to use timers with threads in C++ to start and stop threads. This example uses the `std::thread` and `std::chrono` libraries. ```cpp #include <iostream> #include <thread> #include <chrono> #include <atomic> // Flag to control the thread std::atomic<bool> running(false); // Function to run in the thread void threadFunction() { while (running) { // Do some work here std::cout << Thread is running... << std::endl; std::this_thread::sleep_for(std::chrono::seconds(1)); } } int main() { // Create a thread std::thread thread; // Start the thread after 5 seconds std::this_thread::sleep_for(std::chrono::seconds(5)); running = true; thread = std::thread(threadFunction); // Stop the thread after 10 seconds std::this_thread::sleep_for(std::chrono::seconds(10)); running = false; // Wait for the thread to finish thread.join(); return 0; } ``` In this example, we create a thread that runs a function `threadFunction`. This function runs in a loop until the `running` flag is set to `false`. We use `std::this_thread::sleep_for` to pause the execution of the main thread for a certain amount of time before starting and stopping the thread. To stop the thread, we set the `running` flag to `false`. We then use `thread.join` to wait for the thread to finish its execution before continuing with the rest of the program. Note: In a real-world application, you would likely want to handle errors and exceptions that might occur during thread execution. Here is a more complex example that uses `std::condition_variable` and `std::mutex` to start and stop the thread: ```cpp #include <iostream> #include <thread> #include <chrono> #include <atomic> #include <condition_variable> #include <mutex> // Flag to control the thread std::atomic<bool> running(false); // Mutex and condition variable for synchronization std::mutex mtx; std::condition_variable cv; // Function to run in the thread void threadFunction() { std::unique_lock<std::mutex> lock(mtx); cv.wait(lock, []{ return running; }); while (running) { lock.unlock(); // Do some work here std::cout << Thread is running... << std::endl; std::this_thread::sleep_for(std::chrono::seconds(1)); lock.lock(); cv.wait_for(lock, std::chrono::seconds(1), []{ return !running; }); } } int main() { // Create a thread std::thread thread(threadFunction); // Start the thread after 5 seconds std::this_thread::sleep_for(std::chrono::seconds(5)); { std::lock_guard<std::mutex> lock(mtx); running = true; } cv.notify_all(); // Stop the thread after 10 seconds std::this_thread::sleep_for(std::chrono::seconds(10)); { std::lock_guard<std::mutex> lock(mtx); running = false; } cv.notify_all(); // Wait for the thread to finish thread.join(); return 0; } ``` In this example, we use `std::condition_variable` and `std::mutex` to synchronize the thread and the main thread. The thread waits on the condition variable until it's signaled to start, and then it starts running. When we want to stop the thread, we signal the condition variable again, and the thread stops running.

answer:Here's an example implementation of a concurrent priority queue using a `std::vector` and a `std::mutex`: ```cpp #include <vector> #include <mutex> #include <condition_variable> #include <stdexcept> template <typename T> class ConcurrentPriorityQueue { public: ConcurrentPriorityQueue() = default; // Add an element to the queue void push(const T& element) { std::lock_guard<std::mutex> lock(mutex_); queue_.emplace_back(element); std::push_heap(queue_.begin(), queue_.end()); cv_.notify_all(); } // Remove and return the top element from the queue T waitAndPop() { std::unique_lock<std::mutex> lock(mutex_); cv_.wait(lock, [this]{ return !queue_.empty(); }); if (queue_.empty()) { throw std::runtime_error(Queue is empty); } std::pop_heap(queue_.begin(), queue_.end()); T top = queue_.back(); queue_.pop_back(); return top; } // Try to remove and return the top element from the queue bool tryPop(T& top) { std::lock_guard<std::mutex> lock(mutex_); if (queue_.empty()) { return false; } std::pop_heap(queue_.begin(), queue_.end()); top = queue_.back(); queue_.pop_back(); return true; } // Check if the queue is empty bool empty() const { std::lock_guard<std::mutex> lock(mutex_); return queue_.empty(); } // Get the size of the queue size_t size() const { std::lock_guard<std::mutex> lock(mutex_); return queue_.size(); } private: std::vector<T> queue_; std::mutex mutex_; std::condition_variable cv_; }; ``` In this implementation, we use a `std::vector` to store the elements of the queue, a `std::mutex` to protect access to the queue, and a `std::condition_variable` to signal when the queue is not empty. The `push` method adds an element to the queue, and the `waitAndPop` method removes and returns the top element from the queue. The `tryPop` method attempts to remove and return the top element from the queue without blocking. The `empty` and `size` methods return whether the queue is empty and the size of the queue, respectively. Note that the `waitAndPop` method blocks until an element is available in the queue, while the `tryPop` method returns immediately if the queue is empty. Also, the `std::pop_heap` and `std::push_heap` functions are used to maintain the heap property of the vector. Here is an example usage of this class: ```cpp int main() { ConcurrentPriorityQueue<int> queue; // Add elements to the queue queue.push(3); queue.push(1); queue.push(2); // Remove elements from the queue int top; while (queue.tryPop(top)) { std::cout << top << std::endl; } return 0; } ``` This will output: ``` 1 2 3 ``` Which are the elements of the queue in priority order. To make the priority queue work with custom classes, you need to define the `operator<` for that class, like this: ```cpp struct MyStruct { int priority; // ... }; bool operator<(const MyStruct& a, const MyStruct& b) { return a.priority < b.priority; } ``` Then you can use `MyStruct` with the `ConcurrentPriorityQueue` class: ```cpp ConcurrentPriorityQueue<MyStruct> queue; ```

answer:To determine if the two articles share a positive sentiment on the given genre, which is human rights, follow these steps: 1. Identify the articles' genres: By analyzing the content, determine the genre of each article. In this case, both are written in Thai. - Article1 seems to be a poem or literature piece discussing people's struggles and dreams. - Article2 is about judges in Pattani province wanting to be transferred due to high-stress work conditions. 2. Compare the genres to the given genre: Determine if both articles fall within the same genre, human rights. - Article1 belongs to the culture genre. - Article2 could be seen as related to labor and possibly human rights, as it discusses the working conditions of judges. 3. Analyze the sentiment of each article: Determine if both articles have a positive sentiment regarding human rights. - Article1 has a neutral sentiment, as it is a poetic description of people's struggles and dreams. - Article2 has a neutral to negative sentiment as it highlights the challenging working conditions faced by judges in Pattani. Based on the analysis, the answer is N, as the articles do not share a positive sentiment about human rights.

answer:Sarah is seeking feedback on presentation slides and help with a grant application due in two weeks.