I was implementing quicksort and I wished to set the pivot to be the median or three numbers. The three numbers being the first element, the middle element, and the last element.
Could I possibly find the median in less no. of comparisons?
median(int a[], int p, int r)
{
int m = (p+r)/2;
if(a[p] < a[m])
{
if(a[p] >= a[r])
return a[p];
else if(a[m] < a[r])
return a[m];
}
else
{
if(a[p] < a[r])
return a[p];
else if(a[m] >= a[r])
return a[m];
}
return a[r];
}
If the concern is only comparisons, then this should be used.
int getMedian(int a, int b , int c) {
int x = a-b;
int y = b-c;
int z = a-c;
if(x*y > 0) return b;
if(x*z > 0) return c;
return a;
}
int32_t FindMedian(const int n1, const int n2, const int n3) {
auto _min = min(n1, min(n2, n3));
auto _max = max(n1, max(n2, n3));
return (n1 + n2 + n3) - _min - _max;
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With