Compilare: user.cpp: In function ‘void df(int)’: user.cpp:13:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); i++) ~~^~~~~~~~~~~~~ user.cpp: In function ‘void df_transpus(int)’: user.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < GT[x].size(); i++) ~~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:49:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < sol[i].size(); j++) ~~^~~~~~~~~~~~~~~