十年换你一句好久不见

摘要： Andy's First Dictionary Andy, 8, has a dream - he wants to produce his very own dictionary. This is not an easy task for him, as the number of words t 阅读全文

摘要： http://codeforces.com/problemset/problem/670/D2 http://codeforces.com/problemset/problem/670/D1 time limit per test 1 second time limit per test memor 阅读全文