摘要：Isomorphic Inversion 题目描述 Let s be a given string of up to 106 digits. Find the maximal k for which it is possible to partition s into k consecutive c 阅读全文

摘要：Similarity of Subtrees 题目描述 Define the depth of a node in a rooted tree by applying the following rules recursively:·The depth of a root node is 0.·Th 阅读全文