concat.cpp: In function `bool a_mai_aparut(int)': concat.cpp:30: warning: comparison between signed and unsigned integer expressions concat.cpp: In function `long long unsigned int calculeaza_hash(char*, int)': concat.cpp:59: warning: unused variable `long long unsigned int x' concat.cpp: In function `void DFS(int, std::vector<int, std::allocator<int> >)': concat.cpp:97: warning: comparison between signed and unsigned integer expressions concat.cpp: In function `void scrie()': concat.cpp:120: warning: comparison between signed and unsigned integer expressions