#include<stdio.h>

#include<stdlib.h>

void  merge(int a[], int start,int mid,int end)

{

    int *b=(int*)malloc(sizeof(int)*(end-start+));

    int i=start,j=mid+,k=;

    while(i<=mid&&j<=end)

    {

        if(a[i]<a[j])

        b[k++]=a[i++];

        else

        b[k++]=a[j++];

    }

    while(i<=mid)

    b[k++]=a[i++];

    while(j<=end)

    b[k++]=a[j++];

    for(i=;i<k;i++)

    {

        a[start+i]=b[i];

    }

}