IN C LANGUAGE I HAD AN ERROR. URGENT!!

struct Graph* createGraph(int V, int E)
{
struct Graph* graph = new Graph;
graph->V = V;
graph->E = E;

graph->edge = new Edge[E];

return graph;
}

// A structure to represent a subset for union-find
struct subset {
int parent;
int rank;
};

// A utility function to find set of an element i
// (uses path compression technique)
int find(struct subset subsets[], int i)
{
// find root and make root as parent of i
// (path compression)
if (subsets[i].parent != i)
subsets[i].parent
= find(subsets, subsets[i].parent);

return subsets[i].parent;
}

// A function that does the union of two sets of x and y
void Union(struct subset subsets[], int x, int y)
{
int xroot = find(subsets, x);
int yroot = find(subsets, y);

// Attach smaller rank tree under root of high
// rank tree (Union by Rank)
if (subsets[xroot].rank < subsets[yroot].rank)
subsets[xroot].parent = yroot;
else if (subsets[xroot].rank > subsets[yroot].rank)
subsets[yroot].parent = xroot;

// If ranks are the same, then make one as root and
// increment its rank by one
else
{
subsets[yroot].parent = xroot;
subsets[xroot].rank++;
}
}

// Compare two edges according to their weights.
// Used in qsort() for sorting an array of edges
int myComp(const void* a, const void* b)
{
struct Edge* a1 = (struct Edge*)a;
struct Edge* b1 = (struct Edge*)b;
return a1->weight > b1->weight;
}

// The main function to construct MST using Kruskal's
// algorithm
void KruskalMST(struct Graph* graph)
{
int V = graph->V;
struct Edge
result[V]; // Tnis will store the resultant MST
int e = 0; // An index variable, used for result[]
int i = 0; // An index variable, used for sorted edges

// Step 1: Sort all the edges in non-decreasing
// order of their weight. If we are not allowed to
// change the given graph, we can create a copy of
// array of edges
qsort(graph->edge, graph->E, sizeof(graph->edge[0]),
myComp);

// Allocate memory for creating V ssubsets
struct subset* subsets
= (struct subset*)malloc(V * sizeof(struct subset));

// Create V subsets with single elements
for (int v = 0; v < V; ++v) {
subsets[v].parent = v;
subsets[v].rank = 0;
}

// Number of edges to be taken is equal to V-1
while (e < V - 1 && i < graph->E) {
// Step 2: Pick the smallest edge. And increment
// the index for next iteration
struct Edge next_edge = graph->edge[i++];

int x = find(subsets, next_edge.src);
int y = find(subsets, next_edge.dest);

// If including this edge does't cause cycle,
// include it in result and increment the index
// of result for next edge
if (x != y) {
result[e++] = next_edge;
Union(subsets, x, y);
}
// Else discard the next_edge
}

// print the contents of result[] to display the
// built MST
printf(
"Following are the edges in the constructed MST\n");
int minimumCost = 0;
for (i = 0; i < e; ++i)
{
printf("%d -- %d == %d\n", result[i].src,
result[i].dest, result[i].weight);
minimumCost += result[i].weight;
}
printf("Minimum Cost Spanning tree : %d",minimumCost);
return;
}

Question

IN C LANGUAGE I HAD AN ERROR. URGENT!!

struct Graph* createGraph(int V, int E)
{
struct Graph* graph = new Graph;
graph->V = V;
graph->E = E;

graph->edge = new Edge[E];

return graph;
}

// A structure to represent a subset for union-find
struct subset {
int parent;
int rank;
};

// A utility function to find set of an element i
// (uses path compression technique)
int find(struct subset subsets[], int i)
{
// find root and make root as parent of i
// (path compression)
if (subsets[i].parent != i)
subsets[i].parent
= find(subsets, subsets[i].parent);

return subsets[i].parent;
}

// A function that does the union of two sets of x and y
void Union(struct subset subsets[], int x, int y)
{
int xroot = find(subsets, x);
int yroot = find(subsets, y);

// Attach smaller rank tree under root of high
// rank tree (Union by Rank)
if (subsets[xroot].rank < subsets[yroot].rank)
subsets[xroot].parent = yroot;
else if (subsets[xroot].rank > subsets[yroot].rank)
subsets[yroot].parent = xroot;

// If ranks are the same, then make one as root and
// increment its rank by one
else
{
subsets[yroot].parent = xroot;
subsets[xroot].rank++;
}
}

// Compare two edges according to their weights.
// Used in qsort() for sorting an array of edges
int myComp(const void* a, const void* b)
{
struct Edge* a1 = (struct Edge*)a;
struct Edge* b1 = (struct Edge*)b;
return a1->weight > b1->weight;
}

// The main function to construct MST using Kruskal's
// algorithm
void KruskalMST(struct Graph* graph)
{
int V = graph->V;
struct Edge
result[V]; // Tnis will store the resultant MST
int e = 0; // An index variable, used for result[]
int i = 0; // An index variable, used for sorted edges

// Step 1: Sort all the edges in non-decreasing
// order of their weight. If we are not allowed to
// change the given graph, we can create a copy of
// array of edges
qsort(graph->edge, graph->E, sizeof(graph->edge[0]),
myComp);

// Allocate memory for creating V ssubsets
struct subset* subsets
= (struct subset*)malloc(V * sizeof(struct subset));

// Create V subsets with single elements
for (int v = 0; v < V; ++v) {
subsets[v].parent = v;
subsets[v].rank = 0;
}

// Number of edges to be taken is equal to V-1
while (e < V - 1 && i < graph->E) {
// Step 2: Pick the smallest edge. And increment
// the index for next iteration
struct Edge next_edge = graph->edge[i++];

int x = find(subsets, next_edge.src);
int y = find(subsets, next_edge.dest);

// If including this edge does't cause cycle,
// include it in result and increment the index
// of result for next edge
if (x != y) {
result[e++] = next_edge;
Union(subsets, x, y);
}
// Else discard the next_edge
}

// print the contents of result[] to display the
// built MST
printf(
"Following are the edges in the constructed MST\n");
int minimumCost = 0;
for (i = 0; i < e; ++i)
{
printf("%d -- %d == %d\n", result[i].src,
result[i].dest, result[i].weight);
minimumCost += result[i].weight;
}
printf("Minimum Cost Spanning tree : %d",minimumCost);
return;
}

In this code it gives this error for this line struct Graph* graph = new Graph;
'new' undecleared (first use in this function.) and [Error] expected ',' or ';' before 'Graph|

Accepted Answer

// Kruskal's algorithm in C

#include <stdio.h>

#define MAX 30

typedef struct edge {
  int…