days 11-16

day11/input.txt

@@ -0,0 +1 @@
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Line truncated

day11/part1.js

@@ -0,0 +1,30 @@
+var input = require("fs").readFileSync("input.txt").toString().replace("\n", "");
+var dirs = input.split(",");
+
+var replacements = [
+	[["n", "s"], ""],
+	[["ne", "sw"], ""],
+	[["nw", "se"], ""],
+	[["ne", "nw"], "n"],
+	[["se", "sw"], "s"],
+	[["ne", "s"], "se"],
+	[["se", "n"], "ne"],
+	[["sw", "n"], "nw"],
+	[["nw", "s"], "sw"],
+];
+
+var oldlength = 0;
+while(dirs.length != oldlength){
+	oldlength = dirs.length;
+	for(var replacement of replacements){
+		if(dirs.indexOf(replacement[0][0]) > -1 && dirs.indexOf(replacement[0][1]) > -1){
+			dirs.splice(dirs.indexOf(replacement[0][0]), 1);
+			dirs.splice(dirs.indexOf(replacement[0][1]), 1);
+			if(replacement[1]){
+				dirs.push(replacement[1]);
+			}
+		}
+	}
+}
+
+console.log(dirs.length);

day11/part2.js

@@ -0,0 +1,41 @@
+var input = require("fs").readFileSync("input.txt").toString().replace("\n", "");
+var dirs = input.split(",");
+function simplify(dirs){
+	var replacements = [
+		[["n", "s"], ""],
+		[["ne", "sw"], ""],
+		[["nw", "se"], ""],
+		[["ne", "nw"], "n"],
+		[["se", "sw"], "s"],
+		[["ne", "s"], "se"],
+		[["se", "n"], "ne"],
+		[["sw", "n"], "nw"],
+		[["nw", "s"], "sw"],
+	];
+	var oldlength = 0;
+	while(dirs.length != oldlength){
+		oldlength = dirs.length;
+		for(var replacement of replacements){
+			if(dirs.indexOf(replacement[0][0]) > -1 && dirs.indexOf(replacement[0][1]) > -1){
+				dirs.splice(dirs.indexOf(replacement[0][0]), 1);
+				dirs.splice(dirs.indexOf(replacement[0][1]), 1);
+				if(replacement[1]){
+					dirs.push(replacement[1]);
+				}
+			}
+		}
+	}
+	return dirs;
+}
+
+var maxlen = 0;
+
+for(var i = 0; i < dirs.length; i++){
+	var sub = dirs.slice(0, i);
+	var len = simplify(sub).length;
+	if(len > maxlen){
+		maxlen = len;
+	}
+	console.log(i/dirs.length);
+}
+console.log(maxlen);