摘要：
String Reconstruction Ivan had string s consisting of small English letters. However, his friend Julia decided to make fun of him and hid the string s 阅读全文
摘要：
Permutation Counting Given a permutation a1, a2, … aN of {1, 2, …, N}, we define its E-value as the amount of elements where ai > i. For example, the 阅读全文