三个农民每天清晨5点起床，然后去牛棚给3头牛挤奶。第一个农民在300秒(从5点开始计时)给他的牛挤奶，一直到1000秒。第二个农民在700秒开始，在 1200秒结束。第三个农民在1500秒开始2100秒结束。期间最长的至少有一个农民在...

After getting AC after 13 Time Limit Exceeded verdicts on a geometry problem, Kuroni went to an Italian restaurant to celebrate this holy achievement. Unfortuna...

Carneginon was a chic bard. But when he was young, he was frivolous and had joined many gangs. Recently, Caneginon was to be crowned, because the king was shock...

Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 5659 Accepted: 2361

Cow Laundry Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 1376 Accepted: 886 Description

Watchcow Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 9974 Accepted: 4307 Special Judge Description

You’ve got an n × m pixel picture. Each pixel can be white or black. Your task is to change the colors of as few pixels as possible to obtain a barcode picture.

Dijkstra算法应用了贪心的思想，即“抄近路走”。维护两个集合A和B，A表示已确定最短路径的结点集（红色表示）， B表示邻居结点（蓝色表示）。...

1，控制读入的数据行数，非批处理，有点类似数据库中的指标操作，可对文件中的数据逐行操作。

nl (Number of Lines) 将指定的文件添加行号标注后写到标准输出。如果不指定文件或指定文件为”-” ，程序将从标准输入读取数据。