all done

day24/input.txt

@@ -0,0 +1,56 @@
+31/13
+34/4
+49/49
+23/37
+47/45
+32/4
+12/35
+37/30
+41/48
+0/47
+32/30
+12/5
+37/31
+7/41
+10/28
+35/4
+28/35
+20/29
+32/20
+31/43
+48/14
+10/11
+27/6
+9/24
+8/28
+45/48
+8/1
+16/19
+45/45
+0/4
+29/33
+2/5
+33/9
+11/7
+32/10
+44/1
+40/32
+2/45
+16/16
+1/18
+38/36
+34/24
+39/44
+32/37
+26/46
+25/33
+9/10
+0/29
+38/8
+33/33
+49/19
+18/20
+49/39
+18/39
+26/13
+19/32

day24/part1.js

@@ -0,0 +1,25 @@
+var components = require("fs").readFileSync("input.txt").toString().split("\n").filter(a=>(a)).map(a=>(a.split("/").map(b=>(parseInt(b)))));
+var finalBridges = [];
+function getLongerChains(state){
+	var additions = components.filter(a=>(state.components.indexOf(a) == -1)).filter(a=>(a[0] == state.end || a[1] == state.end));
+	if(additions.length == 0){
+		finalBridges.push(state.components)
+	}
+	else{
+		additions.forEach(a=>{
+			var newState = {
+				components: state.components.slice(),
+				end: a.filter((b,i)=>(i!=a.indexOf(state.end)))[0]
+			}
+			newState.components.push(a);
+			//console.log(newState);
+			getLongerChains(newState);
+		});
+	}
+}
+getLongerChains({
+	components: [],
+	end: 0
+});
+var bridgeLengths = finalBridges.map(bridge=>(bridge.map(a=>(a[0] + a[1])).reduce((a,b)=>(a+b))));
+console.log(bridgeLengths.reduce((g, b)=>((b>g || g==null) ? b : g),null));

day24/part2.js

@@ -0,0 +1,28 @@
+var components = require("fs").readFileSync("input.txt").toString().split("\n").filter(a=>(a)).map(a=>(a.split("/").map(b=>(parseInt(b)))));
+var finalBridges = [];
+function getLongerChains(state){
+	var additions = components.filter(a=>(state.components.indexOf(a) == -1)).filter(a=>(a[0] == state.end || a[1] == state.end));
+	if(additions.length == 0){
+		finalBridges.push(state.components)
+	}
+	else{
+		additions.forEach(a=>{
+			var newState = {
+				components: state.components.slice(),
+				end: a.filter((b,i)=>(i!=a.indexOf(state.end)))[0]
+			}
+			newState.components.push(a);
+			getLongerChains(newState);
+		});
+	}
+}
+getLongerChains({
+	components: [],
+	end: 0
+});
+var bridgeLengths = finalBridges.map(bridge=>(bridge.length));
+var maxLength = bridgeLengths.reduce((g, b)=>((b>g || g==null) ? b : g),null);
+var maxLengthBridges = finalBridges.filter(bridge=>(bridge.length == maxLength));
+var bridgeStrengths = maxLengthBridges.map(bridge=>(bridge.map(a=>(a[0] + a[1])).reduce((a,b)=>(a+b))));
+var maxStrength = bridgeStrengths.reduce((g, b)=>((b>g || g==null) ? b : g),null);
+console.log(maxStrength);