Compilare: user.cpp: In function ‘int main()’: user.cpp:45:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; ++i) { ^ user.cpp:50:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < m; ++i) { ^ user.cpp: In function ‘unsigned int query(size_t, size_t, size_t, size_t, size_t)’: user.cpp:34:1: warning: control reaches end of non-void function [-Wreturn-type] } ^