mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-22 15:42:02 +00:00
25 lines
708 B
C++
25 lines
708 B
C++
#pragma once
|
|
#include <vector>
|
|
|
|
/// Removes duplicates from a container without changing the order of its elements.
|
|
/// Keeps the last occurrence of each element.
|
|
/// Should NOT be used for containers with a lot of elements because it has O(N^2) complexity.
|
|
template <typename T>
|
|
void removeDuplicatesKeepLast(std::vector<T> & vec)
|
|
{
|
|
auto begin = vec.begin();
|
|
auto end = vec.end();
|
|
auto new_begin = end;
|
|
for (auto current = end; current != begin;)
|
|
{
|
|
--current;
|
|
if (std::find(new_begin, end, *current) == end)
|
|
{
|
|
--new_begin;
|
|
if (new_begin != current)
|
|
*new_begin = *current;
|
|
}
|
|
}
|
|
vec.erase(begin, new_begin);
|
|
}
|