Compilare: user.cpp: In function ‘int main()’: user.cpp:23:14: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] gen=(1<<N-1)-1; ~^~ user.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<la[varf].size(); j++) ~^~~~~~~~~~~~~~~~ user.cpp:61:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(v[la[varf][j].val]==1&&j==la[varf].size()-1) ~^~~~~~~~~~~~~~~~~~~