Compilare: user.cpp: In function ‘int main()’: user.cpp:29:15: warning: unused variable ‘k’ [-Wunused-variable] long long k; ^ user.cpp: In function ‘int comun()’: user.cpp:100:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<comb.size();i++){ ^ user.cpp: In function ‘bool next_comb(int)’: user.cpp:108:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz>=0&&(comb[poz]==a-comb.size()+poz+1)) ^ user.cpp:114:12: warning: statement has no effect [-Wunused-value] for(poz;poz<comb.size();poz++) ^ user.cpp:114:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(poz;poz<comb.size();poz++) ^