Compilare: user.cpp: In function ‘void df(int)’: user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void critice(int)’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void bf(int)’: user.cpp:75: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:150: warning: comparison between signed and unsigned integer expressions user.cpp:127: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:128: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:130: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:134: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:159: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:162: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result