Add comments and personal times to READMEs

1 files changed, 43 insertions, 0 deletions

diff --git a/2025/README.md b/2025/README.md
index ece1c89..c72c8a5 100644
--- a/2025/README.md
+++ b/2025/README.md
@@ -6,3 +6,46 @@ from standard input if no argument is provided.
 Example
 
 `python 01/a.py 01/input.txt`
+
+## Personal times
+
+```
+Day   -Part 1-   -Part 2-
+  3   00:05:02   00:16:09
+  2   00:10:36   00:11:55
+  1   00:06:20   00:50:41
+```
+
+## Daily comments (spoilers!)
+
+### Day 1: Secret Entrance
+
+Part 1 was easy. Well, I misread the statement and got it wrong twice,
+but that's on me.
+
+Then I kept getting part 2 wrong, and I have no idea what I was doing wrong.
+Sure, at first I made some mistakes related to landing on zero at the
+end of a movement. But for at least 6-7 times I found a mistake, fixed,
+my code would solve the example case correctly but my answer on the real
+input was wrong. At some point I started rewriting the code in alternative
+ways hoping to get a different answer, and one of those versions worked.
+Still no idea why.
+
+So in the end it took me more than 40 minutes to solve part 2. Great start!
+
+### Day 1: Secret Entrance
+
+I misread the statement for part 1 and I accidentally solved part 2 first.
+I re-read the problem description, fixed my code, submitted it, and then
+I just had to press `Ctrl+Z` (actually `u` on vi...) enough times to solve
+part 2.
+
+### Day 3: Lobby
+
+My solution for part 1 is ad-hoc and not very good. I should have thought
+about it a bit longer, the general solution isn't much harder to find.
+
+For part 2 I used recursion with memorization (using Python's
+`functools.cache`), which is fast enough. But later Chiara pointed
+out to me that actually the solution is quite trivially greedy; I
+implemented the greedy version in `b-alt.py`.