摘要：
It is well known that AekdyCoin is good at string problems as well as number theory problems. When given a string s, we can write down all the non-emp 阅读全文
摘要：
Every morning when they are milked, the Farmer John's cows form a rectangular grid that is R (1 <= R <= 10,000) rows by C (1 <= C <= 75) columns. As w 阅读全文