[Project Euler] Problem 15

Starting in the top left corner of a 22 grid, there are 6 routes (without backtracking) to the bottom right corner.

[Project Euler] Problem 15

How many routes are there through a 2020 grid?

这道题算是中学时的排列组合结果为40!/(20!*20!) = 137846528820

也甭编程了

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