median-comparison/MedianQuicksort.h

40 lines
1023 B
C++

#pragma once
size_t pivotPartition(std::vector<size_t>& values, size_t left, size_t right) {
size_t pivotIndex = left + (right - left) / 2;
size_t pivotValue = values[pivotIndex];
int i = left;
int j = right;
while (i <= j) {
while (values[i] < pivotValue)
{
i++;
}
while (values[j] > pivotValue)
{
j--;
}
if (i <= j) {
std::swap(values[i], values[j]);
i++;
j--;
}
}
return i;
}
void quicksort(std::vector<size_t>& values, size_t left, size_t right)
{
if (left < right) {
size_t pivotIndex = pivotPartition(values, left, right);
quicksort(values, left, pivotIndex - 1);
quicksort(values, pivotIndex, right);
}
}
size_t getQuicksortMedian(std::vector<size_t> values, size_t i)
{
//std::qsort(numbers); // only takes array param -> custom implementation with vector
quicksort(values, 0, values.size() - 1);
return values[i];
}