Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:33:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[x].size() ; i++){ ^ user.cpp: In function ‘int main()’: user.cpp:54:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < sol.size() ; i++) ^