Day 1

01/part1.vim

@@ -0,0 +1 @@
+let @a=":s/(/+1/g␍:s/)/-1/g␍ggVd:put =eval(@@)␍"

01/part2.vim

@@ -0,0 +1,3 @@
+let @z=":%s/(\\([^)]*\\))/+1\\1+1/g␍\e"
+let @a="10000@z"
+let @b=":%s/).*$/+1/␍ggVd:put =eval(@@)␍"