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先介绍怎么建文件目录，，然后使用vi !ls ls !dir 可以列出当前目录的内容 ， ls -l 竖排 ls -m横排 mkdir 建目录 rmdir 只能删空目录 ， 若不为空则用 rm -r dl （递归删除，但是会把你要删除的每一个都问一遍，可回答：Y N） rm -rf dl （不用询问 阅读全文
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Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on it. If she 阅读全文
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Background Professor Hopper is researching the sexual behavior of a rare species of bugs. He assumes that they feature two different genders and that 阅读全文
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Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,000) planks of 阅读全文
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In a highly developed alien society, the habitats are almost infinite dimensional space. In the history of this planet,there is an old puzzle. You hav 阅读全文
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Recently your team noticed that the computer you use to practice for programming contests is not good enough anymore. Therefore, you decide to buy a n 阅读全文
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Adam and Eve enter this year's ACM International Collegiate Programming Contest. Last night, they played the Calendar Game, in celebration of this con 阅读全文
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https://odzkskevi.qnssl.com/cd5694d5c85f39f2036f7473917563e5?v=1502195814 阅读全文
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Each New Year Timofey and his friends cut down a tree of n vertices and bring it home. After that they paint all the n its vertices, so that the i-th 阅读全文
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湫湫减肥 越减越肥！ 最近，减肥失败的湫湫为发泄心中郁闷，在玩一个消灭免子的游戏。 游戏规则很简单，用箭杀死免子即可。 箭是一种消耗品，已知有M种不同类型的箭可以选择，并且每种箭都会对兔子造成伤害，对应的伤害值分别为Di（1 <= i <= M），每种箭需要一定的QQ币购买。 假设每种箭只能使用一次 阅读全文
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Comrade Dujikov is busy choosing artists for Timofey's birthday and is recieving calls from Taymyr from Ilia-alpinist. Ilia-alpinist calls every n min 阅读全文
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https://odzkskevi.qnssl.com/8b9d8bb43198f28efe782047d56ab361?v=1501987995 阅读全文
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Bimokh is Mashmokh's boss. For the following ndays he decided to pay to his workers in a new way. At the beginning of each day he will give each worke 阅读全文
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The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians 阅读全文
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在每年的校赛里，所有进入决赛的同学都会获得一件很漂亮的T-shirt。但是每当我们的工作人员把上百件的衣服从商店运回到赛场的时候，却是非常累的！所以现在他们想要寻找最短的从商店到赛场的路线，你可以帮助他们吗？ Input 输入包括多组数据。 每组数据第一行是两个整数NN,MM(N≤100N≤100, 阅读全文
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Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a calculator on the floor and 阅读全文
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Statements A sequence of positive and non-zero integers called palindromic if it can be read the same forward and backward, for example: 15 2 6 4 6 2 阅读全文
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Statements This is the first day for you at your new job and your boss asks you to copy some files from one computer to other computers in an informat 阅读全文
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A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = <x1, x2, ..., xm> another se 阅读全文