Sun Yiwei

i want to upgrade this algorithm to be able to process sparse martrix,any one can help me with that?

> 当一个进程通过 exit 系统调用退出之后，它所占用的资源并不能够立即全部回收。比如该进程的内核栈目前就正用来进行系统调用处理，如果将放置它的物理页帧回收的话，可能会导致系统调用不能正常处理. 这里有一点小小的疑惑，如果一个进程在exit之前进行了系统调用syscall，那exit不是应该在syscall结束之后才执行么？这个时候为什么会存在仍然进行系统调用的情况？可以举一个更具体的例子吗？

> Hiya. What about trees with `children` fields, which I think is more common than `left`, `mid`, `right` or whatever? Yes, I did consider such implementation before. If I didn't...

@parrt Hi, I just push my new implementation. You can check it out while free. To visualize trees with `children` fields, I create a new function `treeplusviz`(maybe it's not a...