Add '2020/' from commit 'aaabfa90c9033044d0a9d5fe6776b718711ef46c'

git-subtree-dir: 2020
git-subtree-mainline: ab8f135946
git-subtree-split: aaabfa90c9

2020/06/part1.js

@@ -0,0 +1,6 @@
+const fs = require('fs');
+fs.readFile('input', (err, data) => {
+  if (err) throw err;
+  let groups = data.toString().split("\n\n").map( (group) => new Set( group.replace(/\r?\n|\r/g, "").split('') ) );
+  console.log(groups.reduce((sum, group) => sum + group.size, 0));
+});