Compilare: user.cpp: In function ‘void antibfs(ac*)’: user.cpp:150: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:197: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:198: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:199: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:200: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result