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There are n cities and n - 1 roads in the Seven Kingdoms, each road connects two cities and we can reach any city from any other by the roads. Theon a 阅读全文
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1：输入 vim 文件名.cpp 2：进行编辑，编辑操作参考 >初识vim 主要三个步骤 ：1）输入字母 i ， 进入插入编写模式，编写完成后，按esc 退出编写模式，按：wq ，保存并退出，有时需要再wq后加！号 3：输入 g++ 文件名.cpp -o 文件名 ,报错就看看错在哪里，然后再输入-- 阅读全文
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Bran and his older sister Arya are from the same house. Bran like candies so much, so Arya is going to give him some Candies. At first, Arya and Bran 阅读全文
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Problem Description HDU’s n classrooms are on a line ,which can be considered as a number line. Each classroom has a coordinate. Now Little Q wants to 阅读全文
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Problem Description Welcome to HDU to take part in the second CCPC girls’ competition! A new automatic judge system is used for this competition. Duri 阅读全文
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Problem Description The contest starts now! How excited it is to see balloons floating around. You, one of the best programmers in HDU, can get a very 阅读全文
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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