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