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change a typo of C(m+n-2, m-1) #62

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2 changes: 1 addition & 1 deletion C++/chapDFS.tex
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Expand Up @@ -260,7 +260,7 @@ \subsubsection{代码}


\subsection{数学公式}
一个$m$行，$n$列的矩阵，机器人从左上走到右下总共需要的步数是$m+n-2$，其中向下走的步数是$m-1$，因此问题变成了在$m+n-2$个操作中，选择$m–1$个时间点向下走，选择方式有多少种。即 $C_{m+n-2}^{m-1}$ 。
一个$m$行，$n$列的矩阵，机器人从左上走到右下总共需要的步数是$m+n-2$，其中向下走的步数是$m-1$，因此问题变成了在$m+n-2$个操作中，选择$m–1$个时间点向下走，选择方式有多少种。即 $C_{m-1}^{m+n-2}$ 。

\subsubsection{代码}
\begin{Code}
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