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