Merge pull request #544 from aditmehta9/patch-4

Prim's Minimum spanning Tree code in C++

primsminimumspannigtree.cpp

@@ -0,0 +1,65 @@
+#include <stdio.h> 
+#include <limits.h> 
+#include<stdbool.h> 
+
+#define V 5 
+
+int minKey(int key[], bool mstSet[]) 
+{ 
+int min = INT_MAX, min_index; 
+
+for (int v = 0; v < V; v++) 
+    if (mstSet[v] == false && key[v] < min) 
+        min = key[v], min_index = v; 
+
+return min_index; 
+} 
+
+int printMST(int parent[], int n, int graph[V][V]) 
+{ 
+printf("Edge \tWeight\n"); 
+for (int i = 1; i < V; i++) 
+    printf("%d - %d \t%d \n", parent[i], i, graph[i][parent[i]]); 
+} 
+
+void primMST(int graph[V][V]) 
+{ 
+    int parent[V];  
+
+    int key[V];  
+
+    bool mstSet[V];  
+
+    for (int i = 0; i < V; i++) 
+        key[i] = INT_MAX, mstSet[i] = false; 
+
+    key[0] = 0;      
+    parent[0] = -1; 
+    for (int count = 0; count < V-1; count++) 
+    { 
+        int u = minKey(key, mstSet); 
+
+        mstSet[u] = true; 
+
+        for (int v = 0; v < V; v++) 
+
+        if (graph[u][v] && mstSet[v] == false && graph[u][v] < key[v]) 
+            parent[v] = u, key[v] = graph[u][v]; 
+    } 
+
+    printMST(parent, V, graph); 
+} 
+
+int main() 
+{ 
+
+int graph[V][V] = {{0, 2, 0, 6, 0}, 
+                    {2, 0, 3, 8, 5}, 
+                    {0, 3, 0, 0, 7}, 
+                    {6, 8, 0, 0, 9}, 
+                    {0, 5, 7, 9, 0}}; 
+
+    primMST(graph); 
+
+    return 0; 
+}