Compilare: user.cpp: In function ‘int dfs_loop_my(int)’: user.cpp:37: warning: no return statement in function returning non-void user.cpp: In function ‘int dfs_loop_rev(int)’: user.cpp:53: warning: no return statement in function returning non-void user.cpp: In function ‘void read_data()’: user.cpp:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result