摘要： Problem 1692 Key problemAccept: 103 Submit: 553 Time Limit: 1000 mSec Memory Limit : 32768 KBProblem DescriptionWhenever rxw meets Coral, he requires her to give him the laboratory key. Coral does not want to give him the key, so Coral ask him one question. if rxw can solve the problem, she will giv 阅读全文