摘要：
The statement of this problem is the same as the statement of problem C1. The only difference is that, in problem C1, nn is always even, and in C2, nn 阅读全文
摘要：
The statement of this problem is the same as the statement of problem C2. The only difference is that, in problem C1, nn is always even, and in C2, nn 阅读全文
摘要：
You are given a string ss such that each its character is either 1, 2, or 3. You have to choose the shortest contiguous substring of ss such that it c 阅读全文
摘要：
Polycarp has spent the entire day preparing problems for you. Now he has to sleep for at least aa minutes to feel refreshed. Polycarp can only wake up 阅读全文