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57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
(function (exports) {
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'use strict';
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var dfs = (function () {
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function hasPath(graph, current, goal) {
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var stack = [];
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var visited = [];
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var node;
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stack.push(current);
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visited[current] = true;
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while (stack.length) {
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node = stack.pop();
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if (node === goal) {
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return true;
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}
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for (var i = 0; i < graph[node].length; i += 1) {
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if (graph[node][i] && !visited[i]) {
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stack.push(i);
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visited[i] = true;
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}
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}
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}
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return false;
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}
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/**
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* Depth-First graph searching algorithm.
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* Returns whether there's a path between two nodes in a graph.<br><br>
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* Time complexity: O(|V|^2).
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*
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* @module graphs/searching/dfs
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* @public
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* @param {Array} graph Adjacency matrix, which represents the graph.
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* @param {Number} start Start node.
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* @param {Number} goal Target node.
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* @return {Boolean} Returns true if path between two nodes exists.
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*
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* @example
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* var dfs = require('../src/graphs/searching/dfs').dfs;
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* var graph = [[1, 1, 0, 0, 1, 0],
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* [1, 0, 1, 0, 1, 0],
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* [0, 1, 0, 1, 0, 0],
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* [0, 0, 1, 0, 1, 1],
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* [1, 1, 0, 1, 0, 0],
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* [0, 0, 0, 1, 0, 0]];
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* var pathExists = dfs(graph, 1, 5); // true
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*/
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return function (graph, start, goal) {
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return hasPath(graph, start, goal);
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};
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}());
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exports.dfs = dfs;
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}(typeof exports === 'undefined' ? window : exports));
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