摘要:
[USACO16JAN]Subsequences Summing to Sevens S 题目描述 Farmer John's $N$ cows are standing in a row, as they have a tendency to do from time to time. Each 阅读全文
摘要:
[USACO07DEC]Mud Puddles S 题目描述 Farmer John is leaving his house promptly at 6 AM for his daily milking of Bessie. However, the previous evening saw a 阅读全文