Compilare: main.cpp: In function 'void comb()': main.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<combinari.size();++i) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<esuate_sel.size();++j) ~^~~~~~~~~~~~~~~~~~