Merge branch 'master' of https://github.com/marizvi/algos

Author: marizvi

dijkstra/dijkstra.js

@@ -0,0 +1,64 @@
+
+// @raunak kumar jaiswal
+function mindistance(ans, visited) {
+    var min_index = -1;
+    var min_value = Number.MAX_VALUE;
+    for (var i = 0; i < visited.length; i++) {
+        if (visited[i] == 0 && ans[i] < min_value) {
+            min_value = ans[i];
+            min_index = i;
+        }
+    }
+    return min_index;
+}
+
+function dijjj(visited, graph, ans, total) {
+    for (var j = 0; j < total; j++) {
+        var min_index = mindistance(ans, visited);
+        if (min_index == -1) {
+            return
+        }
+        visited[min_index] = 1;
+        var dist = ans[min_index];
+        for (var i = 0; i < graph[min_index].length; i++) {
+            var ele = graph[min_index][i];
+            var vrr = ele[0];
+            var w = ele[1];
+            if (visited[vrr] == 0 && dist + w < ans[vrr]) {
+                ans[vrr] = dist + w;
+            }
+        }
+    }
+}
+
+function make_graph(edge, graph) {
+    edge.forEach(ede => {
+        graph[ede[0]].push([ede[1], ede[2]])
+        graph[ede[1]].push([ede[0], ede[2]])
+    })
+}
+
+const dijkshtra = () => {
+    var node = 6;
+    var graph = [];
+    for (var i = 0; i < node; i++) {
+        graph[i] = [];
+    }
+    var edge = [[0, 1, 1], [0, 3, 7], [1, 3, 5], [0, 2, 3], [1, 2, 1], [1, 4, 3], [4, 5, 6], [5, 2, 2]];
+    make_graph(edge, graph)
+    var ans = new Array(node);
+    var visited = new Array(node);
+    for (var i = 0; i < node; i++) {
+        ans[i] = Number.MAX_VALUE
+        visited[i] = 0;
+    }
+    var sort_dist_from = 0;
+    ans[sort_dist_from] = 0;
+    dijjj(visited, graph, ans, node)
+    console.log("distance from source node that is 0 by default")
+    console.log("node      distance")
+    for (var i = 0; i < ans.length; i++) {
+        console.log(i + "             " + ans[i])
+    }
+}
+dijkshtra()