Compilare: user.cpp: In function ‘void visit(int)’: user.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[node].size(); i++) ^ user.cpp: In function ‘void create(int, int)’: user.cpp:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < Gt[node].size(); i++) ^ user.cpp: In function ‘void write()’: user.cpp:57:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j =0; j < Sol[i].size(); j++) ^