Compilare: user.cpp: In function ‘void add(char*)’: user.cpp:18: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void remove(char*)’: user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void aparitii(char*)’: user.cpp:55: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void prefix(char*)’: user.cpp:70: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void citire()’: user.cpp:79: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:80: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:85: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:86: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result