实现一个内存分配算法，并写出代码；Task([ Process(0,8,40), Process(1,8,42), Process(2,2,32), Process(3,6,47), Process(4,5,35), Process(5,5,38), Process(6,6,29), Process(7,6,24), Process(8,4,24), Process(9,8,22), Process(10,6,32),

Process(11,7,38), Process(12,5,25), Process(13,4,28), Process(14,6,37)])。

这里给出一个基于首次适应算法的内存分配代码实现：

class Process:
    def __init__(self, pid, size, priority):
        self.pid = pid
        self.size = size
        self.priority = priority

class Memory:
    def __init__(self, size):
        self.size = size
        self.free_blocks = [(0, size)]

    def allocate(self, process):
        for i, (start, end) in enumerate(self.free_blocks):
            if end - start >= process.size:
                self.free_blocks[i] = (start + process.size, end)
                return (start, start + process.size)
        return None

    def deallocate(self, pid):
        pass  # 略

def main():
    processes = [Process(0, 8, 40), Process(1, 8, 42), Process(2, 2, 32), Process(3, 6, 47),
                 Process(4, 5, 35), Process(5, 5, 38), Process(6, 6, 29), Process(7, 6, 24),
                 Process(8, 4, 24), Process(9, 8, 22), Process(10, 6, 32), Process(11, 7, 38),
                 Process(12, 5, 25), Process(13, 4, 28), Process(14, 6, 37)]

    memory = Memory(100)
    for process in processes:
        allocation = memory.allocate(process)
        if allocation is not None:
            print(f"Process {process.pid}: {allocation[0]}-{allocation[1]}")
        else:
            print(f"Process {process.pid}: Allocation failed")

if __name__ == '__main__':
    main()

这段代码中，Process类表示进程，包含进程ID、大小和优先级。Memory类表示内存，包含内存大小和空闲块列表。allocate方法实现了首次适应算法，遍历空闲块列表，找到第一个可以容纳进程的块，将其分配给进程，并更新空闲块列表。如果找不到合适的块，则分配失败。deallocate方法实现了内存回收功能，这里省略了实现。

最后，在main函数中，创建进程列表和内存对象，依次对每个进程进行内存分配，并输出分配结果。