Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:21:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<a[nod].size(); j++) { ^ user.cpp: In function ‘int main()’: user.cpp:49:24: warning: unused variable ‘j’ [-Wunused-variable] int i, m, n, x, y, j; ^