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adventofcode
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Yanick Champoux 2021-12-12 13:24:41 -05:00
parent 8de4107b95
commit c1f6916c8b
1 changed files with 25 additions and 28 deletions
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53
2021/12/part2.mjs
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@ -2,53 +2,51 @@ import fs from "fs-extra";
import fp from "lodash/fp.js"; import fp from "lodash/fp.js";
import _ from "lodash"; import _ from "lodash";
import * as p1 from './part1.mjs'; import * as p1 from "./part1.mjs";
export function solution(graph) { export function solution(graph) {
let paths = 0; let paths = 0;
graph.forEachNode( node => { graph.forEachNode((node) => {
graph.setNodeAttribute( node, 'nbrVisits', 0 ) graph.setNodeAttribute(node, "nbrVisits", 0);
} ); });
const left = [ const left = [{ graph, where: "start" }];
{ graph, where: 'start' }
];
while( left.length > 0 ) { while (left.length > 0) {
const position = left.shift(); const position = left.shift();
if( position.where === 'end' ) { if (position.where === "end") {
paths++; paths++;
continue; continue;
} }
const canVisit = (graph,node) => { const canVisit = (graph, node) => {
if(node === 'start') return false; if (node === "start") return false;
if( node === node.toUpperCase() ) return true; if (node === node.toUpperCase()) return true;
const nbrVisits =graph.getNodeAttribute(node,'nbrVisits'); const nbrVisits = graph.getNodeAttribute(node, "nbrVisits");
if(nbrVisits ===0 ) return true; if (nbrVisits === 0) return true;
if(nbrVisits>1) return false; if (nbrVisits > 1) return false;
return !graph.hasAttribute('revisited'); return !graph.hasAttribute("revisited");
} };
for( const n of position.graph.neighbors(position.where) ) {
if( !canVisit( position.graph, n ) ) continue;
for (const n of position.graph
.neighbors(position.where)
.filter((n) => canVisit(position.graph, n))) {
let newGraph = position.graph; let newGraph = position.graph;
if( n === n.toLowerCase() ) { if (n === n.toLowerCase()) {
newGraph = newGraph.copy(); newGraph = newGraph.copy();
newGraph.setNodeAttribute( newGraph.updateNodeAttribute(
n, 'nbrVisits', 1 + newGraph.getNodeAttribute(n,'nbrVisits') n,
"nbrVisits",
fp.add(1)
); );
if (newGraph.getNodeAttribute(n, "nbrVisits") === 2) {
if( newGraph.getNodeAttribute(n,'nbrVisits') === 2 ) { newGraph.setAttribute("revisited", n);
newGraph.setAttribute('revisited',n);
} }
} }
left.unshift({ left.unshift({
@ -56,7 +54,6 @@ export function solution(graph) {
where: n, where: n,
}); });
} }
} }
return paths; return paths;