Compilare: user.cpp: In function ‘void ErathostenesSieve()’: user.cpp:27:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < primes.size() && primes[j] <= low[i] && i * primes[j] <= MAXVAL; j++) ^ user.cpp: In function ‘void Update(int, int, int)’: user.cpp:39:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (tree[node] >= need) ^ user.cpp: In function ‘void Add(long long unsigned int)’: user.cpp:69:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < table[which].size(); i++) ^ user.cpp: In function ‘int Find(long long unsigned int)’: user.cpp:79:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < table[which].size(); i++) ^