Popular Cows Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 27698 Accepted: 11148 Description Every cow's dream is to become the most popular cow in the herd. In a herd of N (1 <= N <= 10,000) cows, you are given up to M (1 <= M &
Going from u to v or from v to u? Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 17993 Accepted: 4816 Description In order to make their sons brave, Jiajia and Wind take them to a big cave. The cave has n rooms, and one-way corridor