solve hw-9

hws/tiktok_trends/README.txt

@@ -1,7 +1,7 @@
 HOMEWORK 9: Tiktok Trends
 
 
-NAME:  < insert name >
+NAME:  Jinshan Zhou
 
 
 COLLABORATORS AND OTHER RESOURCES:
@@ -10,17 +10,21 @@ List the names of everyone you talked to about this assignment
 LMS, etc.), and all of the resources (books, online reference
 material, etc.) you consulted in completing this assignment.
 
-< insert collaborators / resources >
+A lot, like using Top K for better sorting. Difference IO cases (not useful).
+StringCache (not useful). shared_ptr (not really help) and may websites, cases
+that I don't remember anymore.
 
 Remember: Your implementation for this assignment must be done on your
 own, as described in "Academic Integrity for Homework" handout.
 
 
-ESTIMATE OF # OF HOURS SPENT ON THIS ASSIGNMENT:  < insert # hours >
+ESTIMATE OF # OF HOURS SPENT ON THIS ASSIGNMENT:  over 20 hr, 8 hr for complete
+more than 10 hr just for optimization.
 
 
 MISC. COMMENTS TO GRADER:
-(optional, please be concise!)
+The program is a bit messy. Since, I tried too many techniques. Some are broken
+changes, so I have to add patch to it. Myself is also a bit lose to my code.
 
 ## Reflection and Self Assessment
 
@@ -32,5 +36,11 @@ What parts of the assignment did you find challenging? Is there anything that
 finally "clicked" for you in the process of working on this assignment? How well
 did the development and testing process go for you?
 
-< insert reflection >
-
+This was definitely the most challenging assignment I've ever seen, and the
+hard part was identifying performance issues and optimizing them. It was not
+easy, I used various tools like perf and found that the JSON part had the biggest
+overhead. Optimizing it showed immediate results, but then I hit a bottleneck,
+so I started using various schemes, and most of them didn't work. Then I had to
+push back and design the business process from scratch and finally got inspired
+by my professor to use unordered set to get the best performance
+(last 0.1 seconds).