摘要:
There is a programming language in which every program is a non-empty sequence of "<" and ">" signs and digits. Let's explain how the interpreter of t 阅读全文
摘要:
A. Sum in the tree A. Sum in the tree Mitya has a rooted tree with nn vertices indexed from 11 to nn, where the root has index 11. Each vertex vv init 阅读全文