I've got some internal variables I have to store, what kinds of things do I have to keep track of?

计算的时候需要占用多少内存,我需要存储一些内部变量,我需要记录哪些东西呢？

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And by that, I mean, not how much memory do I need to store the size of the input, it's really how much internal memory do I use up as I go through the computation?

需要占用多少内存,我意思并不是，存储输入需要多少内存,而是当我完成这个？

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