Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:17:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:30:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:32:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^