#include <unordered_set>
#include <string>
#include <iostream>
using namespace std;
int main()
{
unordered_set<string> slowa{"piotrek","kasia","zosia","ala","ewa","jan","kuba"};
if(slowa.find("ala")!=slowa.end()) cout<<"znaleziono";
return 0;
}
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