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merge_sort's Introduction

Merge_Sort

#include <stdio.h> #include <stdlib.h>

void sort(int*,int,int); void merge(int*,int,int,int);

int main(void) {

int n;

scanf("%d",&n);

int* arr=(int*)malloc(n*sizeof(int));

for(int i=0;i<n;i++)
scanf("%d",&arr[i]);

sort(arr,0,n-1);

for(int i=0;i<n;i++)
printf("%d ",arr[i]);

return 0;

}

void sort(int* arr,int start,int end) { if(start==end) return;

int middle=(start+end)/2;

sort(arr,start,middle);
sort(arr,middle+1,end);

merge(arr,start,middle,end);

}

void merge(int* arr,int start,int middle,int end) { int n=end-start+1;

int temparr[n];

int i=start,j=middle+1,k=0;



while(k<n)
{
    if(i<=middle&&j<=end)
    {
     if(arr[i]<=arr[j])
     {temparr[k]=arr[i];
     i++;
     }
     
     else
     {temparr[k]=arr[j];
     j++;
     }
    k++;
    }
    else if(i>middle)
    {
        temparr[k]=arr[j];
        j++;
        k++;
    }
    else
    {
        temparr[k]=arr[i];
        i++;
        k++;
    }
}

k=0;

for(int r=start;r<=end;r++,k++)
arr[r]=temparr[k];

}

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