Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:21:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < A[node].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:70:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < solution.size(); i++) { ^ user.cpp:34:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y; ^