摘要： 必有损，损阴以益阳。阴：此指某些细微的、局部的事物。阳：此指事物带整体意义的、全局性的事物。李代桃僵语出《乐府诗集·鸡鸣篇》：“桃生露井上，李树生桃旁，虫来啮[niè]桃根，李树代桃僵，树木身相代，兄弟还相忘？”本意是指兄弟要象桃李共患难一样相互帮助，相互友爱。此计用在军事上，指在敌我双方势均力敌，或者敌优我劣的情况下，用小的代价，换取大的胜利的谋略。 阅读全文

摘要： ZOJ Problem Set - 3689DiggingTime Limit:2 Seconds Memory Limit:65536 KBWhen it comes to theMaya Civilization, we can quickly remind of a term called the end of the world. It's not difficult to understand why we choose to believe the prophecy (or we just assume it is true to entertain ourselves) 阅读全文