Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<a[vf].size(); ++i) ^ user.cpp: In function ‘void citire()’: user.cpp:49:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ user.cpp:52:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d, %d", &x, &y); ^