Compilare: user.cpp: In function ‘void df1()’: user.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[x].size();i++) ^ user.cpp: In function ‘void cnt()’: user.cpp:62:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<din[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:90:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++) ^