摘要：
B - Checkout AssistantCrawling in process...Crawling failedTime Limit:2000MS Memory Limit:262144KB64bit IO Format:%I64d & %I64uSubmitStatusPracticeCodeForces 19BDescriptionBob came to a cash & carry store, put n items into his trolley, and went to the checkout counter to pay. Each item is de 阅读全文
摘要：
PeriodTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 1543 Accepted Submission(s): 746Problem DescriptionFor each prefix of a given string S with N characters (each character has an ASCII code between 97 and 126, inclusive), we want to know whethe 阅读全文