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Commit 94c8900

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solve the problem but with repetitions
1 parent 31d3e9a commit 94c8900

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2 files changed

+55
-2
lines changed

2 files changed

+55
-2
lines changed

‎lab/exercises/10-mixed/critical-routers.js‎

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Original file line numberDiff line numberDiff line change
@@ -9,7 +9,60 @@
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* @return {number[]} - The list of critical routers;
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*/
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function criticalRouters(numRouters, numLinks, links) {
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const graph = buildGraph(numRouters, links);
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const critical = [];
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// console.log({graph});
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for (let curr = 1; curr <= numRouters; curr++) {
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for (let i = 1; i <= numRouters; i++) {
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for (let j = 1; j <= numRouters; j++) {
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if (curr === i || curr === j || i === j) { continue; }
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if (!isConnected(graph, i, j, curr)) {
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critical.push(curr);
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i++;
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break;
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}
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}
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}
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}
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return critical;
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}
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function addEdge(graph, from, to) {
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// console.log('addEdge', {graph, from, to});
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const adjacents = graph.get(from);
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adjacents.add(to);
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}
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function buildGraph(numRouters, links) {
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// console.log('buildGraph', { numRouters, links });
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const graph = new Map();
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const routers = [...Array(numRouters).keys()].map(r => r + 1);
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routers.forEach(r => graph.set(r, new Set()));
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links.forEach(([from, to]) => {
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addEdge(graph, from, to);
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addEdge(graph, to, from);
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});
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return graph;
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}
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function isConnected(graph, i, j, ignore, visited = new Set()) {
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if (i === ignore || j === ignore) return false;
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if (graph.get(i).has(j)) return true;
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for (const adj of graph.get(i)) {
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if (visited.has(adj)) { continue; }
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visited.add(adj);
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if (isConnected(graph, adj, j, ignore, visited)) {
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return true;
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}
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}
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return false;
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}
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module.exports = criticalRouters;

‎lab/exercises/10-mixed/critical-routers.spec.js‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -5,7 +5,7 @@ describe('Critical Routers', () => {
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it('should work', () => {
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const numRouters = 7;
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const numLinks = 7;
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const links = [[0,1],[0,2], [1, 3], [2, 3], [2,5], [5, 6], [3,4]];
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expect(critialRouters(numRouters, numLinks, links)).toEqual([2,3,5]);
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const links = [[1,2], [1, 3], [2, 4], [3,4], [3, 6], [6,7],[4,5]];
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expect(critialRouters(numRouters, numLinks, links)).toEqual([3,4,6]);
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});
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});

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