Compilare: user.cpp: In function ‘int main()’: user.cpp:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < C.size(); i++) ^ user.cpp:27:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (C[i] <= S.top() && S.size() < M) S.push(C[i]); ^ user.cpp:30:76: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (!S.empty() && C[i] > S.top() && S.size() + (C.size() - i - 1) >= M) { ^