Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[x].size(); i++) { ^ user.cpp: In function ‘void graf(int)’: user.cpp:39:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[x].size();j++) ^ user.cpp:33:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,y; ^ user.cpp: In function ‘int main()’: user.cpp:109:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[x].size();j++) ^