Lattice Paths
Starting in the top left corner of a grid, and only being able to move to the right and down, there are exactly routes to the bottom right corner.
How many such routes are there through a grid?
网格路径
从一个网格的左上角出发,若只允许向右或向下移动,则恰好有条抵达右下角的路径。
对于网格,这样的路径有多少条?
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