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:49:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size() / 2; i++) ^ user.cpp:53:31: error: ‘p’ was not declared in this scope x[x.size() - 1 - i] = p; ^ user.cpp:55:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < z.size() / 2; i++) ^ user.cpp:59:31: error: ‘p’ was not declared in this scope z[z.size() - 1 - i] = p; ^ user.cpp:65:21: error: ‘last’ was not declared in this scope a.push_back(last); ^ user.cpp:71:21: error: ‘last’ was not declared in this scope a.push_back(last); ^ user.cpp:77:21: error: ‘last’ was not declared in this scope a.push_back(last); ^