Compilare: user.cpp: In function ‘void read()’: user.cpp:26:24: warning: unused variable ‘q’ [-Wunused-variable] for (int i = 0, x, y, q; i < m; i++) ^ user.cpp: In function ‘void solve(int)’: user.cpp:37:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < q.size(); i++) ^ user.cpp:42:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < q.size(); i++) ^ user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) ^