Public
Edited
Dec 12, 2022
input_day12 = FileAttachment("input_day12.txt").text()
GraphologyLibrary = require('graphology-library@0.7.1/dist/graphology-library.min.js')
elevations=input.replace("S","a").replace("E","z").split("\n").map(r=>r.split("").map(l=>letter_map[l]))
nbr = elevations.length
nbc = elevations[0].length;
E = `${Math.floor(input.search("E")/(nbc+1))}-${input.search("E")%(nbc+1)}`
S = `${Math.floor(input.search("S")/(nbc+1))}-${input.search("S")%(nbc+1)}`
GraphologyLibrary.shortestPath.unweighted. bidirectional(graph,S,E).length-1
graph={
const graph = new graphology.Graph()
for(let row=0;row<nbr;row++){
for(let col=0;col<nbc;col++){
graph.addNode(`${row}-${col}`);
}
}
for(let row=0;row<nbr;row++){
for(let col=0;col<nbc;col++){
if(row>=1 && (elevations[row][col]-elevations[row-1][col])>=-1){
graph.addEdge(`${row}-${col}`,`${row-1}-${col}`);
}
if(row<=(nbr-2) && (elevations[row][col]-elevations[row+1][col])>=-1){
graph.addEdge(`${row}-${col}`,`${row+1}-${col}`);
}
if(col>=1 && (elevations[row][col]-elevations[row][col-1])>=-1){
graph.addEdge(`${row}-${col}`,`${row}-${col-1}`);
}
if(col<=(nbc-2) && (elevations[row][col]-elevations[row][col+1])>=-1){
graph.addEdge(`${row}-${col}`,`${row}-${col+1}`);
}
}
}
return graph
}
graph
letter_map={
let letter_map={}
"abcdefghijklmnopqrstuvwxyz".split("").forEach((elem, i) => {
letter_map[elem] = i
})
return letter_map
}
input=input_day12.slice(0,-1)
input_day12_test = FileAttachment("input_day12_test.txt").text()
graph2={
const graph = new graphology.Graph()
for(let row=0;row<nbr;row++){
for(let col=0;col<nbc;col++){
graph.addNode(`${row}-${col}`);
}
}
for(let row=0;row<nbr;row++){
for(let col=0;col<nbc;col++){
if(row>=1 && (elevations[row][col]-elevations[row-1][col])>=-1){
graph.addEdge(`${row-1}-${col}`,`${row}-${col}`);
}
if(row<=(nbr-2) && (elevations[row][col]-elevations[row+1][col])>=-1){
graph.addEdge(`${row+1}-${col}`,`${row}-${col}`);
}
if(col>=1 && (elevations[row][col]-elevations[row][col-1])>=-1){
graph.addEdge(`${row}-${col-1}`,`${row}-${col}`);
}
if(col<=(nbc-2) && (elevations[row][col]-elevations[row][col+1])>=-1){
graph.addEdge(`${row}-${col+1}`,`${row}-${col}`);
}
}
}
return graph
}
{
const paths = GraphologyLibrary.shortestPath.unweighted.singleSource(graph2,E)
const ijs = Object.keys(paths).map(k=> k.split("-").map(v=>+v))
const trek_lengths= ijs.filter( ij=> elevations[ij[0]][ij[1]]==0).map(ij=>paths[ij.join("-")].length-1)
return trek_lengths.sort((a,b)=>a-b)[0]
}
positions = GraphologyLibrary.layoutForceAtlas2()
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