Compilare: user.cpp:83:2: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:23: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'std::vector<int, std::allocator<int> > find(int)': user.cpp:78: warning: comparison between signed and unsigned integer expressions user.cpp:80: warning: comparison between signed and unsigned integer expressions