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Number of schemes from the upper left corner to the lower right corner of the chessboard (2)
2022-07-06 20:15:00 【Park Xiaoming】
1. From the top left corner (1,1) To the lower right corner (n,m) The number of schemes is C(n + m - 2, n - 1)
2. The sum of the number of schemes from the upper left corner to the lower right corner is C(n + m - 1, n)- 1
3. The first n OK and yes C(n + m - 1, n)
Proof of the third point , You can see E Problem solving Codeforces Global Round 21 A-E - kilo The article - You know
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