Compilare: user.cpp: In function ‘int main()’: user.cpp:45:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol1.size();++i)fout<<sol1[i]<<" "; ^ user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol2.size();++i)fout<<sol2[i]<<" "; ^