diff --git a/C++/chapDynamicProgramming.tex b/C++/chapDynamicProgramming.tex
index 5327de51..f31364c8 100644
--- a/C++/chapDynamicProgramming.tex
+++ b/C++/chapDynamicProgramming.tex
@@ -327,7 +327,7 @@ \subsubsection{代码}
         }
 
         int max_profit = 0;
-        for (int i = 0; i < n; ++i)
+        for (int i = 0; i < n - 1; ++i)
             max_profit = max(max_profit, f[i] + g[i]);
 
         return max_profit;