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diff --git a/notes.md b/notes.md
index 3b94338..d92f8ed 100644
--- a/notes.md
+++ b/notes.md
@@ -201,3 +201,21 @@ same machine?
     14,19600,16384
     15,22500,32768
     ```
+
+Problem 1-1: Comparison of running times
+  For each function `f(n)` and time `t` in the following table, determine the
+  largest size `n` of a problem that can be solved in time `t`, assuming that
+  the algorithm to solve the problem takes `f(n)` microseconds.
+
+
+    ```plaintext
+    |         | 1 second | 1 minute | 1 hour | 1 day |
+    | lg n    |          |          |        |       |
+    | sqrt(n) |          |          |        |       |
+    | n       |          |          |        |       |
+    | nlg(n)  |          |          |        |       |
+    | n^2     |          |          |        |       |
+    | n^3     |          |          |        |       |
+    | 2^n     |          |          |        |       |
+    | n!      |          |          |        |       |
+    ```