Update README.md

README.md

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----
-license: other
-license_name: do-not-use-this-yet-license
-license_link: LICENSE
----
+---
+license: other
+license_name: do-not-use-this-yet-license
+license_link: LICENSE
+---
+
+This dataset contains every Facebook/Meta Hacker Cup problem from 2011 through 2023. For each problem, you'll find these files:
+
+* `<problem_name>.md`: The problem statement formatted in Markdown
+* `<problem_name>.in`: The full input file
+* `<problem_name>.out`: The full output file
+  * Note that some problems accept multiple possible outputs, in which case the full output file is simply an example of an output that would be accepted
+ 
+Note that for problems from 2011 thorugh 2019, the problems were initially typeset in html. For those problems you can find:
+
+* `<problem_name>.html`: The problem statement formatted in HTML
+
+For these problems, the Markdown version of the statement (`<problem_name>.md`) was automatically generated from the HTML version and may contain errors.
+
+For some problems, written solutions/analyses are available:
+
+* `<problem_name>.sol.md`
+
+For some problem, code solutions are available:
+
+* `<problem_name>.(cpp|py|java)`
+
+Some problems contains references to images that look like this:
+
+* `{{PHOTO_ID:<photo_id>}}`, example: `{{PHOTO_ID:923060468192530}}`
+
+In the same folder as the problem statement, you can find `<photo_id>.jpg` or `<photo_id>.gif`