Compilare: user.cpp: In function 'bool cmp(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)': user.cpp:13: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp:60: warning: comparison between signed and unsigned integer expressions