Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:29:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < A[node].size(); i++) { ^ user.cpp: In function ‘void dfs(int)’: user.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < A[node].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:87:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < sol.size(); i++) { ^ user.cpp:50:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y; ^