Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:20:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:107:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < w[i].size(); j++){ ^ user.cpp:114:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[i].size(); j++){ ^