摘要： The sequence of integers a1,a2,…,ak is called a good array if a1=k−1 and a1>0. For example, the sequences [3,−1,44,0],[1,−99] are good arrays, and the 阅读全文

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摘要： 推荐博客 ： https://blog.csdn.net/wbin233/article/details/72998375 以下均转载上文： 简述 康托展开是一个全排列到一个自然数的双射，常用于构建hash表时的空间压缩。设有n个数（1，2，3，4,…,n），可以有组成不同(n!种)的排列组合，康托 阅读全文

摘要： Genghis Khan(成吉思汗)(1162-1227), also known by his birth name Temujin(铁木真) and temple name Taizu(元太祖), was the founder of the Mongol Empire and the grea 阅读全文

摘要： Alice and Bob are going on a trip. Alice is a lazy girl who wants to minimize the total travelling distance, while Bob as an active boy wants to maxim 阅读全文

摘要： A school bought the first computer some time ago(so this computer's id is 1). During the recent years the school bought N-1 new computers. Each new co 阅读全文

摘要： A tree with N nodes and N-1 edges is given. To connect or disconnect one edge, we need 1 unit of cost respectively. The nodes are labeled from 1 to N. 阅读全文

摘要： 随着杭州西湖的知名度的进一步提升，园林规划专家湫湫希望设计出一条新的经典观光线路，根据老板马小腾的指示，新的风景线最好能建成环形，如果没有条件建成环形，那就建的越长越好。 现在已经勘探确定了n个位置可以用来建设，在它们之间也勘探确定了m条可以设计的路线以及他们的长度。请问是否能够建成环形的风景线？如 阅读全文

摘要： There is one last gate between the hero and the dragon. But opening the gate isn't an easy task. There were n buttons list in a straight line in front 阅读全文

摘要： When we are focusing on solving problems, we usually prefer to stay in front of computers rather than go out for lunch. At this time, we may call for 阅读全文