摘要:
Description FGD想从成都去上海旅游。在旅途中他希望经过一些城市并在那里欣赏风景,品尝风味小吃或者做其他的有趣的事情。经过这些城市的顺序不是完全随意的,比如说FGD不希望在刚吃过一顿大餐之后立刻去下一个城市登山,而是希望去另外什么地方喝下午茶。幸运的是,FGD的旅程不是既定的,他可以在某 阅读全文
摘要:
Description You are given a tree, it’s root is p, and the node is numbered from 1 to n. Now define f(i) as the number of nodes whose number is less th 阅读全文
摘要:
Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has 阅读全文
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