摘要：
Pay attention to the non-standard memory limit in this problem. In order to cut off efficient solutions from inefficient ones in this problem, the tim 阅读全文
摘要：
For some binary string ss (i.e. each character sisi is either '0' or '1'), all pairs of consecutive (adjacent) characters were written. In other words 阅读全文
摘要：
You are given an array aa of length nn consisting of zeros. You perform nn actions with this array: during the ii-th action, the following sequence of 阅读全文