摘要：
【题解】Luogu P3110 [USACO14DEC]驮运Piggy Back 题目描述 Bessie and her sister Elsie graze in different fields during the day, and in the evening they both want 阅读全文
摘要：
Luogu P3123 [USACO15OPEN]贝茜说哞Bessie Goes Moo 题目描述 Farmer John and Bessie the cow love to exchange math puzzles in their free time. The last puzzle FJ 阅读全文