Solved Day 01 of AOC 2015 in R

Author: akulumbeg

2015/assignments/day01.md

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+*--- Day 1: Not Quite Lisp ---*
+
+Santa was hoping for a white Christmas, but his weather machine's "snow" function is powered by stars, and he's fresh out! To save Christmas, he needs you to collect fifty stars by December 25th.
+
+Collect stars by helping Santa solve puzzles. Two puzzles will be made available on each day in the Advent calendar; the second puzzle is unlocked when you complete the first. Each puzzle grants one star. Good luck!
+
+Here's an easy puzzle to warm you up.
+
+Santa is trying to deliver presents in a large apartment building, but he can't find the right floor - the directions he got are a little confusing. He starts on the ground floor (floor 0) and then follows the instructions one character at a time.
+
+An opening parenthesis, (, means he should go up one floor, and a closing parenthesis, ), means he should go down one floor.
+
+The apartment building is very tall, and the basement is very deep; he will never find the top or bottom floors.
+
+For example:
+
+    (()) and ()() both result in floor 0.
+    ((( and (()(()( both result in floor 3.
+    ))((((( also results in floor 3.
+    ()) and ))( both result in floor -1 (the first basement level).
+    ))) and )())()) both result in floor -3.
+
+**To what floor do the instructions take Santa?**
+
+*--- Part Two ---*
+
+Now, given the same instructions, find the position of the first character that causes him to enter the basement (floor -1). The first character in the instructions has position 1, the second character has position 2, and so on.
+
+For example:
+
+* ) causes him to enter the basement at character position 1.
+* ()()) causes him to enter the basement at character position 5.
+
+**What is the position of the character that causes Santa to first enter the basement?**