Compilare: user.cpp: In function ‘void printVector(const std::vector<int>&)’: user.cpp:14:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size(); i++) ^ user.cpp: In function ‘void readVector(std::vector<int>&, size_t)’: user.cpp:21:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sz; ++i) ^ user.cpp: In function ‘void norm(std::vector<int>&)’: user.cpp:31:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++ ) ^ user.cpp: In function ‘void subtr(std::vector<int>&, const std::vector<int>&)’: user.cpp:46:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = b.size(); i < a.size(); i++) ^