Eroare de compilare: user.cpp: In function ‘void write()’: user.cpp:12:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:26:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) ^ user.cpp: In function ‘void qs(std::vector<int>&)’: user.cpp:49:60: error: ‘merge’ was not declared in this scope merge(x.begin(), x.end(), y.begin(), y.end(), a.begin()); ^ user.cpp:50:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < z.size(); i++) ^