Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:21:9: warning: unused variable ‘lung’ [-Wunused-variable] int lung; ^ user.cpp: In function ‘int main()’: user.cpp:48:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%i %i %i",&n,&m,&s); ^ user.cpp:53:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%i %i",&a,&c); ^