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Copy pathdelete_element.h
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83 lines (70 loc) · 2 KB
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#ifndef CPP_ALGORITHM_DELETE_ELEMENT_H
#define CPP_ALGORITHM_DELETE_ELEMENT_H
#include <algorithm>
#include <vector>
namespace DeleteElement
{
/**
* \brief Delete duplicate elements in the array.
* \param numbers input array
* \return result array
*/
std::vector<int> DeleteDuplicates(std::vector<int>& numbers);
/**
* \brief Delete duplicate elements in the array.
* \param numbers input array
* \return result array
*/
std::vector<int> DeleteDuplicateElements(std::vector<int>& numbers);
/**
* \brief Delete specific elements in the array.
* \param numbers input array
* \param element specific element
* \return result array
*/
std::vector<int> DeleteSpecificElements(
std::vector<int>& numbers,
int element);
}
// ----------------------------------------------------------------------------
inline std::vector<int> DeleteElement::DeleteDuplicates(std::vector<int>& numbers)
{
if (numbers.empty())
{
return {};
}
int write_index = 1;
for (int i = 1; i < static_cast<int>(numbers.size()); ++i)
{
if (numbers[write_index - 1] != numbers[i])
{
numbers[write_index] = numbers[i];
++write_index;
}
}
return std::vector<int>{numbers.begin(), numbers.begin() + write_index};
}
// ----------------------------------------------------------------------------
inline std::vector<int> DeleteElement::DeleteDuplicateElements(std::vector<int>& numbers)
{
if (numbers.empty())
{
return {};
}
std::ranges::sort(numbers);
numbers.erase(std::ranges::unique(numbers).begin(), numbers.end());
return numbers;
}
// ----------------------------------------------------------------------------
inline std::vector<int> DeleteElement::DeleteSpecificElements(
std::vector<int>& numbers,
const int element)
{
if (numbers.empty())
{
return {};
}
std::erase(numbers, element);
return numbers;
}
#endif