Compilare: user.cpp: In function ‘void Solve(int)’: user.cpp:28:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L[varf].size();i++) ^ user.cpp:34:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L[varf].size();i++) ^ user.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<L[x].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol[i].size();j++) ^