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Copy pathmedian.cpp
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84 lines (70 loc) · 1.21 KB
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#include <bits/stdc++.h>
using namespace std;
int quick(int a[],int l,int h)
{
int pivot=a[h];
int i=l-1;
for(int j=l;j<=h-1;j++)
{
if(a[j]<=pivot)
{
i++;
swap(a[i],a[j]);
}
}
swap(a[i+1],a[h]);
return i+1;//index of pivot element
}
int randomize(int a[],int l,int h)
{
int n=h-l+1;
//generation the random index;
int temp=rand()%n;
swap(a[temp+1],a[h]);
return quick(a,l,h);
}
int quicksort(int a[],int l,int h,int k)
{
if(l<h)
{
int pivot_index=randomize(a,l,h);
if(pivot_index==k)
{
return(a[pivot_index]);
}
if(k>pivot_index)
{
return quicksort(a,l,pivot_index-1,k);
}
else
{
return quicksort(a,pivot_index+1,h,k);
}
}
}
double median(int a[],int n)
{
int ans;
sort(a,a+n);
if(n%2!=0)
{
ans=(double)a[n/2];
}
else
{
ans= (double)(a[(n-1)/2]+a[n/2])/2.0;
}
cout<<ans<<endl;
}
int main()
{
int n;
cin>>n;
int a[n];
for(int i=0;i<n;i++)
{
cin>>a[i];
}
median(a,n);
return 0;
}