Compilare: user.cpp: In function ‘int main()’: user.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sir[x % theta].size(); ++i){ ~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp:31:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sir[x % theta].size() && !exista; ++i){ ~~^~~~~~~~~~~~~~~~~~~~~~~