Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:17:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < G[node].size() ; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:31:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ user.cpp:34:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &x, &y); ^