Compilare: user.cpp: In function ‘void Update(const int&, int)’: user.cpp:48:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[knot].size(); i++) ^ user.cpp: In function ‘void Precalc(const int&)’: user.cpp:56:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[knot].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:86:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (_index < v.size() && v[_index].time <= time) ^