Problem 15

最新推荐文章于 2024-05-28 09:54:05 发布
原创 最新推荐文章于 2024-05-28 09:54:05 发布 · 275 阅读 · 0 ·
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Problem

Starting in the top left corner of a 2×2 grid, there are 6 routes (without backtracking) to the bottom right corner.

How many routes are there through a 20×20 grid?


这道题犯懒了，用WIN7计算器做的，其实就是排列组合中 C 40 20的结果，用计算器按公式计算即可。


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