Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos <= n) ^ user.cpp: In function ‘int main()’: user.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ^ user.cpp:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= m; ++i) ^