prim

#include <stdio.h>
#include <stdlib.h>
#include<stdbool.h>
int main()
{
    int n;
    printf("insert the number of ver :");
    scanf("%d",&n);
    int x[n][n];
    bool visited [n];
   int nedges=0;
   int tw = 0;
int i=0, j=0;

    for (i=0;i<n;i++)
    {  j=0;

        for (j=j+i;j<n;j++)
        {

            if(i==j)
            {
                x[i][j]=0;
            }else
            {
                printf("\n  enter the weight of the edge from %d  to %d \n ",i,j);
                scanf("%d",&x[i][j]);
                //x[i][j]= rand()%999;
                 x[j][i]=x[i][j];
            }

        }
    }
     for (i=0;i<n;i++)
    {
        visited [i]=false;
        for (j=0;j<n;j++)
        {
            printf("%d \t",x[i][j]);
        }
         printf("\n");
    }

    int min;
    int a ,b,s;
    printf("\n from which node do you want to start : ");
    scanf("%d",&s);
    visited[s]= true;

    while(nedges<n-1)
    { min =999;
      a=0;
      b=0;
      for(i=0;i<n;i++)
     {
         if (visited[i]==true)
         {
              for(j=0;j<n;j++)
              {
                  if (visited[j]!=true&&x[i][j]!=0)
                  {

                      if (min > x[i][j])
                        {
                      min = x[i][j];
                      a = i ;
                      b = j ;

                        }
                  }
              }
         }
     }
tw = tw + x[a][b];
printf("\n from %d  to %d  \n",a,b );
visited[b]=true;
 printf("\n total weight : %d \n" ,tw);
nedges++;
    }
return 0;
}