Compilare: user.cpp: In function ‘int main()’: user.cpp:17:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < C.size(); i++) ^ user.cpp:20:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (C[i] <= S.back() && S.size() < M) S.push_back(C[i]); ^ user.cpp:23:77: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (!S.empty() && C[i] > S.back() && S.size() + (C.size() - i - 1) >= M) { ^