模拟操作系统内存管理，采取最先适应分配。输入进程长度自动在内存中分配空间，并可以按进程名撤销进程释放其内存空间-Simulate the operating system memory management, to take the first to adapt to the distribution. Enter the length of the process of automatically allocate space in memory and can be removed by the process name of the process to release its memory space