diff --git a/problems/0077.组合优化.md b/problems/0077.组合优化.md
index 9736549c..0c816bc1 100644
--- a/problems/0077.组合优化.md
+++ b/problems/0077.组合优化.md
@@ -130,6 +130,10 @@ public:
     }
 };
 ```
+* 时间复杂度: O(n * 2^n)
+* 空间复杂度: O(n)
+
+
 
 # 总结