Compilare: user.cpp: In function ‘int DFS(int)’: user.cpp:16:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:30:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &n); ^ user.cpp:34:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &val[i]); ^ user.cpp:43:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d%d", &a, &b); ^