#include<windows.h>
#include<stdio.h>
#include<string.h>
 
int main(){
    WIN32_FIND_DATA FindFileData;
    HANDLE hf=FindFirstFile("c:\\*", &FindFileData);
    CHAR fileNames[200][MAX_PATH];
    INT i=0;
    if (hf==INVALID_HANDLE_VALUE){puts("Path not found"); return 1;}
        do{
            strcpy(fileNames[i], FindFileData.cFileName);
            puts(fileNames[i]);
            ++i;
        }
        while (FindNextFile(hf,&FindFileData));
        FindClose(hf);
    return 0;
}

set<WCHAR> f1;  //объявили
int main(){
    WIN32_FIND_DATA FindFileData, FindFileData2;
    HANDLE hf1=FindFirstFile(L"C:\\dir\\*", &FindFileData);
    WCHAR fileNames[200][MAX_PATH];
    INT i=0;
	cout<<"dir1:"<<endl;
    if (hf1==INVALID_HANDLE_VALUE){puts("Path not found"); return 1;}
        do{
			f1.insert(FindFileData.cFileName);
           }
        while (FindNextFile(hf1,&FindFileData));
        FindClose(hf1);

set <WCHAR*> f1;  //объявили
int main(){

     WIN32_FIND_DATA FindFileData, FindFileData2;
    HANDLE hf1=FindFirstFile(L"C:\\dir\\*", &FindFileData);
    INT i=0;
    cout<<"dir1:"<<endl;
    if (hf1==INVALID_HANDLE_VALUE){puts("Path not found"); return 1;}
        do{
            f1.insert(&FindFileData.cFileName[0]);
			copy(f1.begin(), f1.end(), ostream_iterator<WCHAR*>(cout, " "));
			
           }
        while (FindNextFile(hf1,&FindFileData));
        FindClose(hf1);