ExtThes_Uniquify, C++ (vc++)

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//Title of this code
//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23026 for x86

#define UNICODE

#include <iostream>
#include <algorithm>
#include <functional>
#include <vector>
#include <string>
#include <cctype>
#include <array>
#include <cwchar>
#include <windows.h>

#include <atlstr.h>

using namespace ATL;
using namespace std;

vector<CString> Unique(const wchar_t**words, int cWords)
	{
		vector<const wchar_t *> v(words, words + cWords);

sort(v.begin(), v.end(), [](const wchar_t *strA, const wchar_t *strB) {
			return wcscmp(strA, strB) < 0;
		});

v.erase(std::unique(v.begin(), v.end(), [](const wchar_t *strA, const wchar_t *strB) {
			return 0 == wcscmp(strA, strB);
		}), v.end());

v.erase(remove_if(v.begin(), v.end(), [](const wchar_t *str){
			return 0 == CString(str).Trim().GetLength();
		}), v.end());

vector<CString> vs(v.size());
		transform(v.begin(), v.end(), vs.begin(), [](const wchar_t* w){ return w; });

return vs;
	}

vector<CString> Unique(vector<CString> &vWords)
	{
		sort(vWords.begin(), vWords.end(), [](const CString strA, const CString strB) {
			return strA < strB;
		});

vWords.erase(std::unique(vWords.begin(), vWords.end(), [](const CString strA, const CString strB) {
			return strA == strB;
		}), vWords.end());

vWords.erase(remove_if(vWords.begin(), vWords.end(), [](CString str){
			return 0 == str.Trim().GetLength();
		}), vWords.end());

return vWords;
	}

int main() 
{
    // remove duplicate elements (normal use)
    const wchar_t* words [] = {L"ZUERICH",L"Aachen",L"Berlin",L"zuerich",L"Berlin",L"Aachen",L"Frankfurt",L"Zuerich", L" ", L"  ", L"   ", L""};
    vector<CString> strings = {L"ZUERICH",L"Aachen",L"Berlin",L"zuerich",L"Berlin",L"Aachen",L"Frankfurt",L"Zuerich", L" ", L"  ", L"   ", L""};
    
    vector<CString> vords = Unique( words, _countof( words));
    
    for (const CString &i : vords)
      std::wcout << i.GetString() << L"|";
    std::wcout << L"%\n";
    
    Unique(strings);
    
    for (const CString &i : strings)
      std::wcout << i.GetString() << L"|";
    std::wcout << L"$\n";
    
}

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Compilation time: 1.4 sec, absolute running time: 0.56 sec, absolute service time: 1.98 sec