Compilare: user.cpp: In function ‘ull go(ull)’: user.cpp:29:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:36:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; ++i) ^ user.cpp:39:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int Q, i = 0; i < q; ++i) { ^ user.cpp:43:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (sol >= step && go (sol - step) >= Q) ^