Compilare: main.cpp: In function 'void verif(std::vector<int>)': main.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < x.size();++i) ~~^~~~~~~~~~ main.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol.count() == D) ~~~~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:111:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sols.size(); i++) { ~~^~~~~~~~~~~~~ main.cpp:115:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i<vcs.size();++i) ~^~~~~~~~~~~