摘要：
Ball bearingsTime Limit: 5000/1000 MS (Java/Others)Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 71Accepted Submission(s): 34 Problem DescriptionThe Swedish company SKF makes ball bearings. As explained by Britannica Online, a ball bearing is “one of the two types of rolling, or ant 阅读全文