subtree(users/wpcarro): docking briefcase at '24f5a642' r/3226

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+# Dotted Squares
+
+This is my second attempt at solving this problem. I had an hour to solve it the
+first time, and I unfortunately came up short although I made good progress.
+
+The problem asks to read input from a text file that looks like this:
+
+```
+1     -- board width
+1     -- board height
+4     -- number of lines of "moves" (below)
+0 0 R -- create a unit vector (0,0) facing right
+0 0 U -- create a unit vector (0,0) facing up
+0 1 L -- create a unit vector (0,1) facing left
+1 1 D -- create a unit vector (1,1) facing down
+```
+
+After parsing and validating the input, score the outcome a game where players
+one and two alternatively take turns drawing lines on a board. Anytime one of
+the players draws a line that creates a square from existing lines, they get a
+point.