days 11-16

day14/part1.js

@@ -0,0 +1,32 @@
+function hash(input){
+	var list = [];
+	for(var i = 0; i < 256; i++){
+		list.push(i);
+	}
+	var pos = 0;
+	var lengths = input.split("").filter((a)=>(a)).map((a)=>(a.charCodeAt(0))).concat([17, 31, 73, 47, 23]);
+	var skip = 0;
+	for(var x = 0; x < 64; x++){
+		for(var length of lengths){
+			for(var i = 0; i < (length/2); i++){
+				var a = list[(pos+i)%list.length];
+				var b = list[(pos+length-1-i)%list.length];
+				list[(pos+i)%list.length] = b;
+				list[(pos+length-1-i)%list.length] = a;
+			}
+			pos += length + skip;
+			pos = pos % list.length;
+			skip += 1;
+		}
+	}
+
+	var hash = list.reduce((arr, a, i)=>{arr[Math.floor(i/16)] = arr[Math.floor(i/16)] ^ a; return arr;}, []);
+	return hash.map((a)=>(a.toString(2).split("").map((b)=>(parseInt(b))).reduce((a,b)=>(a+b)))).reduce((a, b)=>(a+b));
+}
+
+var total = 0;
+for(var i = 0; i < 128; i++){
+	total += hash("xlqgujun-" + i);
+}
+
+console.log(total);

day14/part2.js

@@ -0,0 +1,61 @@
+function hash(input){
+	var list = [];
+	for(var i = 0; i < 256; i++){
+		list.push(i);
+	}
+	var pos = 0;
+	var lengths = input.split("").filter((a)=>(a)).map((a)=>(a.charCodeAt(0))).concat([17, 31, 73, 47, 23]);
+	var skip = 0;
+	for(var x = 0; x < 64; x++){
+		for(var length of lengths){
+			for(var i = 0; i < (length/2); i++){
+				var a = list[(pos+i)%list.length];
+				var b = list[(pos+length-1-i)%list.length];
+				list[(pos+i)%list.length] = b;
+				list[(pos+length-1-i)%list.length] = a;
+			}
+			pos += length + skip;
+			pos = pos % list.length;
+			skip += 1;
+		}
+	}
+
+	var hash = list.reduce((arr, a, i)=>{arr[Math.floor(i/16)] = arr[Math.floor(i/16)] ^ a; return arr;}, []);
+	return hash.map((a)=>(("00000000" + a.toString(2)).slice(-8).split("").map((b)=>(parseInt(b))))).reduce((a, b)=>(a.concat(b)));
+}
+
+var grid = [];
+for(var i = 0; i < 128; i++){
+	grid.push(hash("xlqgujun-" + i));
+}
+
+var seen = [];
+function calc(x, y){
+	return (x + (128 * y));
+}
+function scanNeighbours(x, y){
+	if(grid[x]){
+		if(grid[x][y]){
+			if(seen.indexOf(calc(x,y)) == -1){
+				seen.push(calc(x,y));
+				scanNeighbours(x+1,y);
+				scanNeighbours(x-1,y);
+				scanNeighbours(x,y+1);
+				scanNeighbours(x,y-1);
+			}
+		}
+	}
+}
+
+var total = 0;
+for(var x = 0; x < 128; x++){
+	for(var y = 0; y < 128; y++){
+		if(grid[x][y]){
+			if(seen.indexOf(calc(x,y)) == -1){
+				total++;
+				scanNeighbours(x,y);
+			}
+		}
+	}
+}
+console.log(total);