Merge pull request csubhasundar#173 from Prekshya12/main

Create Kruskal.cpp

Author: sherigar

c++/Kruskal.cpp

@@ -0,0 +1,68 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Edge
+{
+    public:
+    int source;
+    int destination;
+    int weight;
+
+};
+
+bool compare(Edge e1,Edge e2)
+{
+    return (e1.weight<e2.weight);
+}
+
+int find(int v,int *parents)
+{
+    if(parents[v]==v)
+    {
+        return v;
+    }
+    return find(parents[v], parents);
+}
+
+bool Union(Edge *output,Edge *input,int v,int *parents)
+{
+    int count=0,i=0;
+    while(count<v-1)
+    {
+        int parentS=find(input[i].source,parents);
+        int parentD=find(input[i].destination,parents);
+        if(parentS!=parentD)
+        {
+            output[count]=input[i];
+            count++;
+            parents[parentS]=parents[parentD];
+        }
+        i++;
+    }
+}
+
+int main() {
+    // Write your code here
+    int v,e;
+    cin>>v>>e;
+    Edge *input=new Edge[e];
+    for(int i=0;i<e;i++)
+    {
+        cin>>input[i].source>>input[i].destination>>input[i].weight;
+    }
+
+    sort(input,input+e,compare);
+
+    int *parents=new int[v];
+    for(int i=0;i<v;i++)
+    {
+        parents[i]=i;
+    }
+    Edge *output=new Edge[v-1];
+    Union(output,input,v,parents);
+
+    for(int i=0;i<v-1;i++)
+    {
+        cout<<min(output[i].source,output[i].destination)<<" "<<max(output[i].source,output[i].destination)<<" "<<output[i].weight<<endl;
+    }
+}