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  • Wednesday 18 September 2013

    #include<stdio.h>
    #include<stdlib.h>
    int *a;
    void m_sort(int,int);
    void sort(int,int,int);

    main()
    {
      int n,i;
      printf("Enter the number of elements (it should be power of 2) ");
      scanf("%d",&n);
      a=(int *)calloc(n,sizeof(int));
      printf("Enter the values ");
      for(i=0;i<n;i++)
      scanf("%d",a+i);
      m_sort(0,n-1);
      printf("The sorted array is \n");
      for(i=0;i<n;i++)
      printf("%d ",a[i]);
      return;
    }
    void m_sort(int i,int j)
    {
      int mid;
      if(j-i==0)
      return;
      else
      {
      mid=(i+j)/2;
      m_sort(i,mid);
      m_sort(mid+1,j);
      sort(i,mid,j);
      return;
      }
    }
    void sort(int i,int mid,int j)
    {
      int *b,k,n,m;
      n=i;
      m=mid+1;
      b=(int *)calloc((j+1),sizeof(int));
      for(k=0;k<=j;k++)
      {
      if(n<=mid&&m<=j)
      {
      if(a[n]<a[m])
      b[k]=a[n++];
      else
      b[k]=a[m++];
      }
      else if(n>mid)
      b[k]=a[m++];
      else
      b[k]=a[n++];
      }
      for(k=0;k<=j;k++)
      a[i++]=b[k];
      return;
    }

    Tuesday 17 September 2013

    Written by Wyes

    #include<stdio.h>
    #include<stdlib.h>
    int *a;
    void quicksort(int,int);
    int partition(int,int);
    void swap_w(int,int);
    int random_partition(int,int);
    int random_number(int,int);
    main()
    {
      int i,j,n;
      printf("Enter the number of elements ");
      scanf("%d",&n);
      a=(int *)calloc(n,sizeof(int));
      printf("Enter the elements\n");
      for(i=0;i<n;i++)
      scanf("%d",a+i);
      quicksort(0,n-1);
      printf("The sorted sequence is\n");
      for(i=0;i<n;i++)
      printf("%d ",a[i]);
      printf("\n");
      return;
    }
    void quicksort(int i,int j)
    {
      int k;
      if(j-i<1)
      return;
      else
      {
      k=random_partition(i,j);
      quicksort(i,k-1);
      quicksort(k+1,j);
      return;
      }
    }
    random_partition(int i,int j)
    {
      int k;
      k=random_number(i,j);
      swap_w(k,j);
      return(partition(i,j));
    }
    int partition(i,j)
    {
      int m,n;
      m=i-1;
      for(n=i;n<j;n++)
      {
        if(a[n]<=a[j])
    {
    m++;
    swap_w(m,n);
    }
      }
      swap_w(m+1,j);
      return(m+1);
    }
    int random_number(int i,int j)
    {
      return((rand()%(j-i))+i);
    }
    void swap_w(int i,int j)
    {
      int temp;
      temp=a[i];
      a[i]=a[j];
      a[j]=temp;
      return;
    }
    Written by Kousik
    /* c program for bubble sort*/
    #include<stdio.h>
    int a[20];
    void bubble(int n)
    {
       int t, i,j;
       for(j=n-1;j>0;j++)
       {
        for(i=0;i<j;i++)
    {
    if(a[i+1]>a[i])
    {
     t=a[i];
     a[i]=a[i+1];
     a[i+1]=t;
    }
    }
       }
    }
    int main()
    {
      int n,i;
      printf("Enter the total number of elements: ");
      scanf("%d",&n);
      printf("Enter the values: ");
      for(i=0;i<n;i++)
      scanf("%d",&a[i]);
      bubble(n);
      printf("The sorted sequence: ");
      for(i=0;i<n;i++)
      printf(" %d",a[i]);
      return 0;