最短剩余时间优先

def SRTN(processes):
    ready_queue = []
    current_time = 0
    
    while processes or ready_queue:
        # 将到达的进程加入就绪队列
        for process in processes:
            if process.arrival_time <= current_time:
                ready_queue.append(process)
        
        # 移除已完成的进程
        ready_queue = [p for p in ready_queue if not p.is_completed()]
        
        if ready_queue:
            # 选择剩余时间最短的进程
            next_process = min(ready_queue, key=lambda p: p.remaining_time)
            execute_process(next_process, current_time)
            current_time += next_process.execution_time
        else:
            current_time += 1  # 如果没有进程可执行，时间前进
        
        # 更新进程状态
        for process in processes:
            if process.arrival_time <= current_time and not process.is_started():
                process.start(current_time)