add task 4 text

proton · proton · commit bb0c75352092 · 2021-06-16T19:07:55.000-05:00
diff --git a/week4/elementary-symbol-tables/interview-questions/task4/TASK.md b/week4/elementary-symbol-tables/interview-questions/task4/TASK.md
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+### Web tracking
+
+Suppose that you are tracking `n` web sites and `m` users and you want to support the following API:
+
+- User visits a website.
+- How many times has a given user visited a given site?
+
+What data structure or data structures would you use?
