Fix some typos / latex leftovers

.vitepress/config.mts

@@ -91,7 +91,7 @@ export default withMermaid(
  { text: '6. Text Justification', link: '/exams/justify/' },
  { text: '7. Photographing Skyscrapers', link: '/exams/photo-skyscraper/' },
  { text: '8. Non-deterministic Finite Automata', link: '/exams/finite-automata/' },
- { text: '9. Least Common Anchestor', link: '/exams/least-common-ancestor/' },
+ { text: '9. Least Common Ancestor', link: '/exams/least-common-ancestor/' },
  { text: '10. Building Trees', link: '/exams/building-trees/' },
  { text: '11. Square Code', link: '/exams/square-code/' },
  { text: '12. Rock, Paper, Scissors', link: '/exams/rock-paper-scissors/' },

exams/finite-automata/index.md

@@ -73,7 +73,7 @@ To that end, implement the function
 ```haskell
 accepts :: (Eq a, Eq b) => Automaton a b -> [b] -> Bool
 ```
-which takes and automaton and a list of symbols that represents the word, and returns \texttt{True}
+which takes and automaton and a list of symbols that represents the word, and returns **True**
 iff the word is accepted. Notice, `a` and `b` are instances of `Eq`. The function is used as
 follows.
 ```haskell

exams/least-common-ancestor/index.md

@@ -35,7 +35,7 @@ $7$ and $7$ is $7$.
 In Racket, implement a function `(common-ancestor x y tree)` that takes 
 two nodes `x`, `y` and a binary tree `tree`, and returns the least common-ancestor
 of `x` and `y` in `tree`. If `x` or `y` does not belong to `tree`,
-the function returns \Verb|#f|.
+the function returns `#f`.
 
 To represent binary trees in Racket, use the following structures:
 ```scheme
@@ -66,7 +66,7 @@ Your file should be called `ancestor.rkt` and should export the `find-path` and
  (struct-out node)
  (struct-out leaf))
 
-(struct node (val kids) #:transparent)
+(struct node (val left right) #:transparent)
 (struct leaf (val) #:transparent)
 
 (define (find-path x tree)

exams/photo-skyscraper/index.md

@@ -34,7 +34,7 @@ visible.
 
 In Racket, write a function `(best-view city)` that outputs the direction with the most roofs
 visible, along with the number of roofs visible from that direction. The direction should be one of
-four symbols: `'N`, `'S`, `'E`, and `'N`. The result should be a pair of the format
+four symbols: `'N`, `'S`, `'E`, and `'W`. The result should be a pair of the format
 `'(direction . number)`.
 
 ```scheme