摘要:
题目描述 There is an integer sequence a of length n and there are two kinds of operations:0 l r: select some numbers from al...ar so that their xor sum is 阅读全文
摘要:
题目描述 After returning with honour from ICPC(International Cat Programming Contest) World Finals, Tom decides to say goodbye to ICPC and start a new per 阅读全文