Compilare: user.cpp:73:2: warning: no newline at end of file user.cpp: In function 'void calc_prefix(const std::string&, int*)': user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void find_matches(const std::string&, const std::string&, int*, std::vector<int, std::allocator<int> >&, int*)': user.cpp:28: warning: comparison between signed and unsigned integer expressions user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:59: warning: comparison between signed and unsigned integer expressions